Last update 5 November 2008
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Introduction A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Lines without codes London Underground system
Phil Deaves, Swindon, Wiltshire
I am always grateful for additional information, whether entirely new records (particularly historical records), or information to fill in gaps or correct errors, via the email address above. Thank you.
| Code | Line Name | Mileages | Datum | Notes |
|---|---|---|---|---|
| MAB | Mablethorpe Branch | 128.07 - 149.43 | King's Cross | Willoughby Junction to Mablethorpe Junction, Louth |
| MAC | Manvers Main Colliery Branch | 0.18 - 0.57 | Wath Central Junction | |
| MAC | Manchester and Cleethorpes Line | see separate portions | ||
| MAC1 | Dunford Bridge (LM/ER boundary) to Pennistone | 22.20 - 28.38 (??) | Manchester London Road via Woodhead | |
| MAC2 | Penistone to Deepcar | 29.13 (??) - 33.35 | Manchester London Road via Woodhead | |
| MAC3 | Deepcar to Cleethorpes | 33.11 - 112.42 | Manchester London Road via Woodhead | |
| MAD | Malton to Driffield Line | 0.00 - 19.43 | Malton East Junction | |
| MAE | Maesycwmmer Branch/Fleur de Lis Branch | 10.11 - 10.69 | Taff Vale Extension Junction | |
| MAH | Manningtree and Harwich Line | 59.35 - 70.60 | Liverpool Street | |
| MAI | Maindee East Loop | 41.28 - 41.65 | Rotherwas Junction | |
| MAJ | Manchester and Allerton (Hunts Cross) Junction Line | 6.11 - 34.04 | Liverpool Central | |
| MAK | Monkland and Kirkintilloch Branch | ?? | ?? | Line starts at Kirkintilloch Basin |
| MAL | Malmesbury Branch | see separate portions | ||
| MAL1 | Dauntsey Junction to connection from Little Somerford Station | 87.63 - 91.18 | Paddington via Swindon and Dauntsey | |
| MAL2 | Little Somerford to Malmesbury | 89.66 - 93.35 | Paddington via Swindon and Brinkworth | 90.29 - 93.35 formerly 91.18 - 94.23 ex Paddington via Swindon and Dauntsey. Line remiled 1933 |
| MAM | Maltby Colliery Branch (Shireoaks) | see separate portions | ||
| MAM1 | Maltby Colliery South Junction to Maltby Colliery | 8.62 - 9.30 | Brancliffe East via Maltby Colliery South Junction (reverse) | |
| Maltby Colliery Branch Junction to mileage change | 9.26 - 9.62 | Brancliffe East Junction | Former definition | |
| MAM2 | Maltby Colliery South Junction to Maltby Colliery Bunker | 0.01 - 0.43 | Maltby Colliery Branch Junction | |
| MAN | Mangotsfield South Loop | now MAP | ||
| MAN | Manton Colliery Branch (Worksop) | see separate portions | ||
| MAN1 | Manton Colliery | 0.00 - 0.15 | Junction with MAN2 | |
| MAN2 | Manton Colliery Branch | 58.56 - 59.01 | Manchester London Road via Woodhead | |
| MAP | Mangotsfield South Loop | 0.00 - 0.33 | Mangotsfield Station Junction | Formerly MAN |
| MAR | Marefield to Leicester Line | 0.00 - 10.03 | Marefield Junction South | |
| MAS | Manchester and Sheffield Line (Totley Tunnel East to Chinley North Junction) | 153.75 - 174.01 | St Pancras via Leicester and Toton | |
| MAT | Mold and Tryddyn Branch | see separate portions | ||
| MAT1 | Mold to Llanfynydd | 0.00 - 4.20 | Tryddyn Junction | South east of Mold on line to Mold Junction, 4.20 is mileage at Coed Talon |
| MAT2 | Wrexham & Minera Extension Line | 0.00 - 2.60 | Brymbo Junction | Joint GW & LNW to end on Junction with LNW at 2.67. Coed Talon to Padeswood? |
| MAU | Mauldslie Branch | 0.00 - 1.22 | Mauldlie Branch Junction | Off Law Junction to Shawfield Colliery Branch |
| MAV | Menstrie to Alve Branch | 1.73 - 3.45 | Cambus | Or from 2.12 |
| MAX | Maxwelltown Branch (Dumfries) | 0.24 - 3.06 | Dumfries | |
| MAY | Mayfield Branch | 0.00 - 1.13 | Mayfield Branch Junction | Between Hurlford and Galston, G&SW |
| MBA | Marsh Barton Estate Branch | 0.00 - 0.22/0.25 - 0.47 | Marsh Barton Junction/Exeter Railway Junction (reverse, reverse count) | Formerly MBE |
| MBB | Musselburgh Branch | 4.54 - 6.00 | Edinburgh Waverley | Newhailes Junction to Musselburgh |
| MBD | Melton to Bottesford Branch | 20.28 - 34.46 | Welham Junction | To Bottesford North Junction |
| MBE | Marsh Barton Estate Branch | now MBA | ||
| MBE | Moor Row and Birksbridge Line | 2.14 - 3.49 | Mire House Junction | |
| MBH | Masham Branch | 0.00 - 7.45 | Melmerby station | |
| MBL | Mangotsfield to Bath Line | 124.45 - 134.60 | Derby | |
| MBN | Masborough North Curve | 163.07 - 163.70 | St Pancras | |
| MBO | Marlborough Branch | see separate portions | ||
| MBO1 | Savernake Junction to High Level | 70.12 - 75.58 | Paddington | Parts 1 and 2 not confirmed |
| MBO2 | Realligned Route | 16.25 - 16.50 | Red Post Junction | Parts 1 and 2 not confirmed |
| MBT | Melton and Bottesford Line | 20.33 - 21.20 | Welham Junction | |
| MBW | Middlesbrough and Whitby Line | see separate portions | ||
| MBW1 | Guisborough Junction to Battersby Junction | 0.00 - 10.49 | Guisborough Junction | |
| MBW2 | Battersby Junction to Grosmont Junction | 11.61 - 29.66 | Picton | |
| MBW3 | Grosmont Junction to Whitby | 24.44 - 30.62 | Rillington Junction | |
| MBY | Moss Bay Branch | see separate portions | ||
| MBY1 | Moss Bay Branch | 0.00 - 1.43 | Harrington Junction | Moss Bay branch ( South) |
| MBY2 | Derwent Works Branch | 0.00 - 0.48 | Branch junction | Moss Bay branch (North) |
| MCB | Markham Colliery Branch | 7.00 - 7.05 | Pleasley Colliery West Junction via Markham Colliery Junction (reverse) | Mileage counts down from Markham Colliery Junction |
| MCC | Mansfield Colliery South | 0.00 - 1.00 | ?? | Datum unknown: presumably branch junction |
| MCG | Maryport and Carlisle Goods Lines | 0.00 - 0.40 | Currock Junction | Currock Junction to Rome Street Junction |
| MCH | Macclesfield and Cheadle Hulme Line | -0.20 - 9.37 | Cheadle Hulme | |
| MCJ | Marylebone to Claydon L&NE Junction | see separate portions | ||
| MCJ1 | Marylebone and Harrow Line | 197.05 - 205.78 | Manchester | |
| MCJ2 | Metropolitan & GC Joint Line (Amersham to Verney Junction) | 9.13 - 50.57 | Baker Street | 9.13 - 25.20 LUL property |
| MCJ3 | Great Central Main Line (Annesley to Quainton Road via Calvert Junction) | 69.59 - 161.50 | Manchester | |
| MCJ4 | Claydon Loop (Calvert Junction to Claydon L&NE Junction) | 0.00 - 0.41 | Calvert Junction | |
| MCJ5 | ?? | ?? | Manchester | |
| MCL | Midland City Line (Moorgate to Kentish Town) | 0.00 - 4.03 | Moorgate | |
| MCO | Manners Colliery Branch | 0.00 - 0.50 | Manners Branch Junction | Original length 0.59, near Ilkeston |
| MCS | Margam Cripple and Holding Sidings | 198.58 - 199.32 | Paddington via Stroud | |
| MCY | Mosside Colliery Branch | 0.00 - 0.61 | Mosside Colliery Siding, Bathgate Upper | Remainder of branch RCH |
| MDB | Maryport Dock Branch | 0.00 - 0.47 | Maryport Junction | |
| MDC | Middlewood Curve | 0.00 - 0.56 | High Level Junction | Middlewood Junction to High Level Junction |
| MDE | Mossend East Curve | 0.00 - 0.31 | Mossend South Junction | |
| MDH | Mold to Denbeigh Line | see separate portions | ||
| MDH1 | Pen-y-fford Connecting Line to Chester to Mold Branch | 0.00 - 0.31 | Pen-y-fford Junction | Formerly PSS1 |
| MDH2 | Mold to Denbeigh | 0.00 - 14.74 | Mold | Mold to Mold & Denbigh Junction |
| MDI | Moor Lane Junction to Marsh (Diton Brook Iron Works) Branch | 0.00 - 1.42 | Moor Lane Junction | Near Widnes. Listed to 1.23 |
| MDL | Manchester Diggle and Leeds Line | see separate portions | ||
| MDL1 | Thornhill LNW Junction to Holbeck East Junction | 32.16 - 42.06 | Manchester Victoria via Huddersfield | |
| MDL2 | Holbeck East Junction to Whitehall West Junction | 42.06 - 42.25 | Manchester Victoria via Huddersfield | |
| MDN | Mossend North Curve | -0.07 - 0.40 | Mossend North Junction | |
| MDT | Maiden Lane Depot Line | 5.17 - 5.50 | Broad Street | |
| MDW | Mossend West Curve | 91.08 - 91.50 | Carlisle | |
| MDY | Maerdy Branch/Rhondda Fach Branch | 16.13 - 22.62 + colliery | Cardiff Bute Road | |
| MDZ | Marsh Depot Goods Branch/St Philips Marsh Goods Branch | 117.58 - 118.12 | Paddington via Box | |
| MEB | Moorgate Branch | see separate portions | ||
| MEB1 | Open portion | 0.00 - 3.32 | Moorgate | |
| MEB2 | Closed portion | ~2.56 - 3.39 | Moorgate | |
| MED | Mile End (Devonshire St) Sidings (Stratford) | 1.50 - 2.02 | Liverpool Street | Listed from 0.08 |
| MEE | Medbourne Branch | 0.00 - 3.25 | Drayton Junction | |
| MEG | Merthyr Goods Branch | now MRG | ||
| MEG | Marsh East Junction: Grimsby Line Curve (to Marsh North Junction) | 0.00 - 0.14 | Marsh East Junction | |
| MEL | Meon Valley Line (Butts Junction to Knowle Junction) | 50.19 - 72.40 | Waterloo via Wimbledon, Guildford (reverse) and Tongham | |
| MEN | Muirhouse South Junction to Strathbungo Junction (Glasgow Central) | see separate portions | ||
| MEN1 | Muirhouse Central Junction to Eglinton Street Junction | 0.19 - 0.68 | Muirhouse South Junction | |
| MEN2 | Muirhouse South Junction to Muirhouse Central Junction | 0.00 - 0.19 | Muirhouse South Junction | |
| MEP | Methley and Pontefract Line | 59.03 - 61.08 | Manchester Victoria via Rochdale, Wakefield Kirkgate and Pontefract Monkhill (reverse) | Cutsyke Junction to Methley Junction Midland Railway |
| MER | Merthyr Branch | 0.00 - 6.24 | Gelli Tarw Junction | 5.71 - 6.24 now 24.19 - 25.02 in CAM |
| MEW | Methley Junction to Whitwood Junction Curve (Castleford) | see separate portions | ||
| MEW1 | Methley Junction to Methley Junction for Whitwood | 61.08 - 61.12 | Manchester Victoria via Rochdale, Wakefield Kirkgate and Pontefract Monkhill (reverse) | |
| MEW2 | Methley Junction for Whitwood to Whitwood Junction | 0.00 - 1.12 | Whitwood Junction | |
| MEX | Merthyr Extension Line | 15.31 - 19.33 | Abergavenny Junction | |
| MEY | Mellis to Eye Line | 0.00 - 2.71 | Mellis | |
| MEZ | Merthyr Low Level Loop | 0.00 - 0.19 | Ynysfach Loop Junction | |
| MFB | Maud to Fraserburgh Branch | 30.77 - 46.61 | Aberdeen | |
| MFD | Mansfield Line | see separate portions | ||
| MFD1 | Kirkby South Junction to Mansfield Colliery end on with CEM | 0.00 - 6.32 | Kirkby South Junction | Great Central Railway's Mansfield Railway route |
| MFD2 | Mansfield South Junction to Rolleston Junction | 139.66 - 154.47 | St Pancras | |
| MFD3 | Mansfield Colliery Branch | 142.20 - 143.66 | St Pancras | From Mansfield Colliery Branch Junction |
| MFN | Milfraen Branch | 2.07 - 2.52 | Brynmawr | Waenavon Station to Milfraen Colliery |
| MGE | Milngavie Branch | 6.19 - 9.35 | Glasgow Queen Street High Level via Maryhill | |
| MGS | Meikleriggs Branch | 0.00 - 0.60 | Meikleriggs Branch Junction | South of Paisley, Chain Road, Caledonian Railway |
| MGW | Milford Curve (Milford West Junction to Gascoigne Wood Junction) | 6.27 - 7.62 | Selby South Junction | |
| MGY | Middlesbrough Goods Yard | 0.00 - c1.20 | Newport East Junction | |
| MGZ | Gilbertsons Branch | 7.51 - 7.66 | Swansea St Thomas Station | |
| MHB | Hadfields Branch | 0.00 - 0.28 | Hadfield's Branch Junction | On Sheffield District Railway between West Tinsley and Brightside Junction |
| MHE | Millerhill Junction to Millerhill Yard Junction Line | 0.50 - 0.71 | ?? | |
| MHH | Morecambe and Heysham Branch | 0.00 - 4.05 | Morecambe Junction | |
| MHL | Millerhill Branch | see separate portions | ||
| MHL1 | Wanton Walls to Monktonhall Junction | 5.60 - 6.12 | Haymarket Central Junction | Millerhill West Junction to Millerhill South Junction |
| MHL2 | Millerhill South Junction to Wanton Walls | 0.01 - 1.40 | Millerhill South Junction | |
| MHL3 | Millerhill East Junction to Millerhill Yard | 0.00 - 0.20 | Millerhill East Junction | |
| MHS | Mirehouse and Sellafield Line | 0.00 - 9.44 | Mire House Junction | |
| MHY | Millerhill Yard Lines | 6.25 - 7.08 | Haymarket Central Junction | Niddrie West Junction to Niddrie South Junction |
| MIA | Manchester International Airport Rail Link Line | 0.00 - 1.46 | Manchester International Airport Station | |
| MIB | Montrose to Inverbervie Branch | 31.15 - 43.10 | Dundee Tay Bridge | |
| MID | Middleton Branch | 5.22 - 6.24 | Manchester Victoria | |
| MIH | Mirfield to Huddersfield Line | 0.00 - 4.37 | Mirfield Junction | Midland Railway, originally 190.21 - 194.58 from St Pancras |
| MII | Mistley Incline | 0.00 - 0.60 | Mistley Junction | |
| MIK | Micklehurst Line (Stalybridge Junction to Diggle Junction) | 8.03 - 14.70 | Manchester Victoria | |
| MIL | Milford Haven Branch/Old Milford Branch | 280.70 - 285.00 + docks | Paddington via Stroud | |
| MIN | Minehead Branch | 165.13 - 187.76 | Paddington via Box | |
| MIR | Mersey Loop Line | see separate portions | ||
| MIR1 | Mann Island Junction to Mann Island Junction (Liverpool Loop Line) | 0.00 - 2.21 | Mann Island Junction via Moorfields | |
| MIR2 | Mann Island Junction to Rock Ferry Station | 0.69 - 3.46 | Mann Island Junction via Moorfields | |
| MIS | Millbrook to Southampton Western Docks Branch | 79.79 - 80.33 + docks | Waterloo | |
| MIT | Middleton Towers Branch (King's Lynn) | 0.20 - 3.44 | King's Lynn Junction | Line runs to Dereham as MTD |
| MJB | Bude Branch | 199.78 - 228.12 | Waterloo | |
| MJD | Marsh Junction Depot (Down Side) | 0.14 - 0.45 | North Somerset Junction | |
| MJI | Madeley Junction to Ironbridge Line | see separate portions | ||
| MJI1 | Madeley Junction to Lightmoor Junction | 156.19 - 160.16 | Paddington via Oxford and Birmingham Snow Hill | |
| MJI2 | Ketley Junction to Ironbridge via Lightmoor Junction | 160.01 - 166.63 | Paddington via Didcot, Charlbury and Buildwas East Junction (reverse) | |
| MJR | Morlais Junction to Rhydycar Junction | 18.75 - 23.56 | Brecon | |
| MJS | Melbourne Junction and Sinfin Branch | see separate portions | ||
| MJS1 | Melbourne Junction to Chellaston East Junction | 127.27 - 131.15 | St Pancras via Trent Junction, Sheet Stores Junction, Chellaston East Junction (127.27) and Melbourne Junction (131.15) | Formerly from Ashby (at 117.66) |
| MJS2 | Ashby-de-la-Zouch to Chellaston East Junction | 0.00 - 10.71 | Ashby-de-la-Zouch | |
| MJT | Mansfield Junction to Trowell Junction Line | see separate portions | ||
| MJT1 | Mansfield Junction to Radford Junction | 124.22 - 125.55 | St Pancras via Corby | |
| MJT2 | Radford Junction to Trowell Junction | 125.55 - 130.56 | St Pancras via Corby | |
| MJU | Marsh Junction Depot (Up Side) | 0.17 - 0.64 | North Somerset Junction | |
| MJW | Mitcham Junction to Wimbledon Line | 0.00 - 3.04 | Wimbledon | |
| MKB | Monk Bretton Branch (Grimethorpe) | see separate portions | ||
| MKB1 | Cudworth Junction to mileage change | 0.00 - 0.34 | Cudworth Junction | |
| MKB2 | Mileage change to Monk Bretton | 175.72 - 176.22 | St Pancras via Leicester, Toton and Barrow Hill | |
| MKK | Muirkirk Branch | 35.50 - 58.17 | Bridge Street Junction via Dalry | To end on junction with Caledonian Railway Lanark to Muirkirk line |
| MKT | Market Drayton Branch | 161.67 - 188.66 | Paddington via Didcot | |
| MLA | Maryhill Park Junction to Anniesland Line | 4.62 - 5.51 | High Street via Hyndland | original measure |
| 0.00 - 0.74 | Maryhill Park Junction | current measure | ||
| MLD | Mouldron Branch | ?? | ?? | Near Fauldhouse |
| MLE | Millerhill East Curve | 0.09 - 0.28 | Millerhill Yard ?? | |
| MLF | Manuel Fork | 0.00 - 0.58 | Almond Junction | Almond Junction to Bo'ness High Junction |
| MLG | Mallaig Line | see separate portions | ||
| MLG1 | Fort William Junction to Banavie Junction | -0.02 - 1.26 | Fort William Junction | |
| MLG2 | Banavie Junction to Mallaig | 0.00 - 39.39 | Banavie Junction | |
| MLK | Mawcarse to Ladybank (Fife and Kinross) Branch | 0.76 - 8.46 | Mawcarse | |
| MLL | Moss Lane Junction to Lostock Hall Engine Shed Junction (Walton to Preston) Line | 24.57 - 25.38 | Liverpool Exchange | |
| MLN | Hackney Yard | 213.42 - 213.75 | Paddington via Box and Plymouth Millbay (reverse) | |
| MLN | Main Line (Paddington to Penzance via Bath) | see separate portions | ||
| MLN1 | Paddington to North Road Junction | 0.00 - 246.08 | Paddington via Box | |
| MLN2 | Cornwall Loop Junction to St Germans | 247.28 - 256.38 | Paddington via Box and Plymouth Millbay (reverse) | |
| MLN3 | St Germans to mileage change point east of Chacewater | 256.40 - 305.65 | Paddington via Box and Plymouth Millbay (reverse) | |
| MLN4 | Mileage change point east of Chacewater to Penzance | 305.67 - 326.50 | Paddington via Box and Plymouth Millbay (reverse) | |
| MLN5 | Plymouth North Road to Millbay station | 246.08 - 246.64 | Paddington | 246.64 (Millbay station) - 247.22 doubled |
| MLN6 | Bristol Temple Meads Old Station | 118.16 - 118.39 | Paddington | |
| MLN7 | Plymouth North Road west side of triangle | 247.22 - 247.42 | Paddington via Box and Plymouth Millbay (reverse) | |
| MLP | Middlemuir Loop | 0.00 - 0.33 | Woodlay junction | Woodlay Junction to Middlemuir Junction, Kirkintilloch |
| MLS | Margam Loco and Sorting Sidings | 198.34 - 199.30 | Paddington via Stroud | |
| MLT | Moat Lane Junction to Talyllyn | 52.18 - 108.27 | Whitchurch Cambrian Junction via Oswestry | |
| MLY | Millerhill Yard | 0.20 - 0.52 ?? | Millerhill East Junction ?? | Possibly 5.21 - 5.53 from Edinburgh Waverley |
| MMB | Mynydd Mawr Branch/Llanelly & Mynydd Mawr Line | 0.00 - 12.35 | Mynydd Mawr Stages | |
| MMC | Markham Main Colliery Branch (Stainforth) | 0.00 - 0.61 | Markham Colliery Junction | |
| MMH | Middlesbrough Marsh Line | see separate portions | ||
| MMH1 | Middlesbrough Marsh Branch | 0.00 - 0.56 | Marsh Branch Junction | |
| MMH2 | ?? | ?? | ?? | |
| There were several other interconnected lines in this area: It is not certain which if any apply to MMH2 |
||||
| MML | Mynydd Mawr Loop | 0.00 - 0.23 | Llanelly Low Level Junction | |
| MMP | March Motive Power Depot | 86.13 - 86.45 | Liverpool Street via Clapton and Ely | |
| MMW | Moira West Junction to Shackerstone | now AMS | ||
| MMZ | Maes-y-Marchog Branch | 0.00 - 1.59 + colliery | Onllywn Junction | |
| MNB | Methven Branch | 5.18 - 5.78 | Almond Valley Junction | Mileage suspect, Methven Junction is 4.61 and Methven is a further 1.20 |
| MNC | Monkton Main Colliery Branch | 0.00 - 1.03 | Monkton Empty Sidings Box | A new line opened from this box at 51.29 on Hull & Barnsley Line on 01.06.1958 |
| MNG | Morningside Branch | 0.00 - 13.44 | Polkemmet Junction | North British Railway route |
| MNL | Mid Notts Joint Line | 2.64 - 4.73 | Farnsfield Junction on Mansfield to Rolleston Junction line | Farnsfield Junction to Boughton for Ollerton Colliery, the portion listed starts south of footbridge 36 (2.67) and ends just after bridge 44 (4.68) |
| MOA | Mountain Ash deviation | 0.00 - 0.38 | south end of deviation | |
| MOB | Moretonhampstead Branch | 0.09 - 12.34 | Newton Abbot | |
| MOD | MOD Chilmark (off BAE2) Branch | 91.72 - 93.41 +/- private sidings | Waterloo | |
| MOF | Muir of Ord to Fortrose (Black Isle) Branch | 0.20 - 13.40 | Muir of Ord | |
| MOL | Motherwell Old Line | ?? | ?? | Location uncertain |
| MON | Monkland Branch | ?? | ?? | See also MLP, CME, MAK |
| MOO | Moorfields Branch | 0.00 - 0.37 | Moorfields Junction | |
| MOR | Morriston Branch | 0.00 - 3.29 | Haford Junction | Formerly 0.00 - 3.21; junction moved and line remiled 1964 |
| MOS | Mossend Branch | ?? | ?? | |
| MOT | Moffat Branch (Beatock to Moffat) | ?? | ?? | |
| MOU | Mountain Branch/Crosshands Branch | 0.00 - 4.03 + colliery | Mountain Branch Junction | |
| MOW | Mowbray Branch | 0.00 - 0.58 | Eskett Junction | Near Cleator Moor |
| MPC | Motspur Park and Chessington Branch | 10.11 - 14.32 | Waterloo | |
| MPM | Moffat Paper Mill Branch | 0.00 - 1.23 | Springbank Quarry Junction, Clarkston (Lanark) | |
| MPR | Miles Platting and Rochdale Line | see separate portions | ||
| MPR1 | Miles Platting to Thorpes Bridge Junction | 1.30 - 2.17 | Manchester Victoria | |
| MPR2 | Thorpes Bridge Junction to Oldham Werneth Junction | 2.14 - 6.15 | Manchester Victoria | |
| MPR3 | Oldham Werneth Junction to Rochdale | 6.15 - 14.27 | Manchester Victoria | |
| MPR4 | Middleton Junction to Oldham Werneth Junction | 5.37 - 6.68 | Manchester Victoria | |
| MPT | Merton Park to Tooting Line | 3.56 - 5.51 | Streatham South Junction | |
| MRB | Milner Royd Junction and Bradford Interchange Line | 29.21 - 40.27 | Manchester Victoria via Rochdale | |
| MRC | Moor Row Junction to Corkickle Branch | 72.71 - 73.30 | Carnforth | Parallels CBC from Mirehouse Junction for 39ch north |
| MRG | Merthyr Goods Branch | 23.62 - 24.28 | Cardiff Bute Road | Formerly MEG |
| MRH | Macclesfield and Rose Hill Marple Branch | 0.00 - 11.02 | Macclesfield | |
| MRJ | Margam Moors Junction | 198.64 - 199.20 | Paddington via Stroud | |
| MRL | Maryhill Line (Westerton to Cowlairs West Junction) | see separate portions | ||
| MRL1 | Maryhill Park Junction to Cowlairs West Junction | 5.51 - 8.26 | High Street via Hyndland | |
| MRL2 | Maryhill Park Junction to Knightswood North Junction | 4.40 - 5.69 | Glasgow Queen Street High Level | |
| MSC | Masborough South Curve | 161.50 - 161.75 | St Pancras via Chesterfield and Treeton | Masboro' South Junction to Holmes Junction |
| MSD | Manchester South District Railway | see separate portions | ||
| MSD1 | Heaton Mersey Junction to Heaton Mersey South Junction | 0.00 - 0.66 | Heaton Mersey Station Junction | Heaton Mersey Station Junction to Heaton Mersey East Junction with CLC |
| MSD2 | Heaton Mersey Station South Junction to Chorlton Junction | 182.22 - 185.54 | St Pancras | |
| MSG | March and Spalding Line | see separate portions | ||
| MSG1 | Whitemoor Junction to Grassmoor Junction | 86.17 - 87.08 | Liverpool Street via Clapton and Ely | |
| MSG2 | Grassmoor Junction to former Regional Boundary | 25.07 - 26.53 | Huntingdon South Junction via St Ives (reverse) | |
| MSG3 | Former Regional boundary to Spalding | 26.53 - 44.07 | Huntingdon South Junction via St Ives (reverse) | |
| MSK | Misk Branch (Stevenston) | 0.00 - 0.57 + chemical works | Nobel Branch Junction, Stevenston No 1 Box | Datum is junction with LGS1 |
| MSL | Small Heath South Junction to Birmingham Moor Street | 128.40 - 128.70 | Paddington via Didcot | |
| MSM | Morecambe South Junction and Morecambe Branch | -0.01 - 2.27 | Morecambe South Junction | |
| MSN | Marston Branches | see separate portions | ||
| MSN1 | Marston Branch | 0.00 - 1.37 | Northwich East Junction | Also known as Salt Branch No 1 |
| MSN2 | Marston Branch No 2 | 0.00 - 0.46 | Wincham Lane Crossing Box on Marston Branch No 1 | Also known as Salt Branch No 2 |
| MSN3 | Marston Branch No 3 | 0.00 - 0.70 | Northwich Central Junction | Also known as Salt Branch No 3 |
| MSR | Mossend Spur | ?? | ?? | |
| MSS | Misson Branch | ?? | ?? | North Lincolnshire |
| MST | Mosley Street Branch | 0.00 - 0.28 | Mosley Street Branch Junction, Burton Station South Box | |
| MSV | Morriston and Swansea Vale Branch | 1.34 - 6.23 | Swansea St Thomas Station | |
| MSW | Minster South to Minster West Curve | 81.67 - 82.18 | Charing Cross via Chelsfield and Canterbury West | |
| MSZ | Moreton & Shipston Tramway/Shipston-On-Stour Branch | 91.49 - 100.56 | Paddington via Didcot and Charlbury | |
| MTA | Merthyr Tredegar and Abergavenny Line | 0.00 - 18.16 | Abergavenny Junction | 13.74 - 15.31 = part RRZ 25.26 - 26.63 ex Cardiff East Dock |
| MTD | Middleton Towers to Dereham line | 3.44 - 21.40 | King's Lynn Junction | Continuation of MIT |
| MTE | Menstrie Branch (Stirling) | 0.17 - 2.12 + distillery | Cambus | |
| MTJ | Mickle Trafford Junctions | see separate portions | ||
| MTJ1 | Up/Down Warrington Line | 0.00 - 0.15 | Mickle Trafford Junction | |
| MTJ2 | Up/Down Passenger Line | 35.24 - 35.41 | Manchester Central | |
| MTL | Methil Docks Branch (Glenrothes) | see separate portions | ||
| MTL1 | Thornton North Junction to East Fife Central Junction | 0.13 - 4.65 | Thornton North Junction | |
| MTL2 | East Fife Central Junction to Methil Boundary | 5.09 - 7.34 | Thornton West Junction via Wemyss Castle | |
| MTM | Meltham Branch | 0.00 - 4.76 | Meltham Junction, Lockwood No 2 Box | |
| MTN | Morton Branch | 0.00 - 1.68 | Morton Branch Junction | |
| MTY | Minsterley Branch | 0.00 - 4.53 | Cruckmeole Junction | |
| MUP | March Up and Down Yards | 85.35 - 85.69 | Liverpool Street via Clapton and Ely | |
| MVB | Manchester Victoria and Bury Line | see separate portions | ||
| MVB1 | Manchester Victoria to Queens Road Junction | -0.02 - 1.38 | Manchester Victoria via Collyhurst Tunnel | |
| MVB2 | Queens Road Junction to Radcliffe North Junction | 1.21 - 7.65 | Manchester Victoria via Cheetham Hill Junction | |
| MVB3 | Radcliffe North Junction to Bury Loco Junction | 7.65 - 8.63 | Manchester Victoria via Cheetham Hill Junction | |
| MVB4 | Bury Loco Junction to Bury Loop Junction | 8.63 - 9.73 | Manchester Victoria via Cheetham Hill Junction | |
| MVC | Manvers Main Colliery Branch (Midland) | 0.00 - 0.04 | Manvers Main Colliery Junction | also listed 169.08 - 169.10 |
| MVE | Manchester Victoria and Euxton Junction Line | see separate portions | ||
| MVE1 | Manchester Victoria to Bolton | -0.04 - 10.55 | Manchester Victoria | |
| MVE2 | Bolton to Euxton Junction | 10.50 - 25.31 | Manchester Victoria | |
| MVL | Manchester Victoria and Huddersfield Line | see separate portions | ||
| MVL1 | Miles Platting to Stalybridge Junction | 1.30 - 7.46 | Manchester Victoria via Stalybridge | |
| MVL2 | Stalybridge Junction to Stalybridge Station | 7.46 - 7.74 | Manchester Victoria via Stalybridge | |
| MVL3 | Stalybridge Station to Heaton Lodge Junction | 7.74 - 29.45 | Manchester Victoria via Stalybridge | |
| MVL4 | Heaton Lodge South Junction (formerly Heckmondwike Junction) to Heaton Lodge East Junction | 28.78 - 29.74 | Manchester Victoria via Stalybridge | |
| MVM | Manchester Victoria and Miles Platting Line | -0.02 - 1.31 | Manchester Victoria | |
| MVN | Manchester Victoria and Normanton Line | see separate portions | ||
| MVN1 | Manchester Victoria to Thorpes Bridge Junction | 0.00 - 2.31 | Manchester Victoria | |
| MVN2 | Thorpes Bridge Junction to Normanton | 2.14 - 50.31 | Manchester Victoria via Rochdale | |
| MVR | Manifold Valley Light Railway | 0.00 - 8.21 | Waterhouses | |
| MVY | Moss Valley Branch | 0.70 - 2.62 | Croes Newydd North Junction | |
| MVZ | Merthyr Vale Branch | 0.00 - 0.24 + colliery | Merthyr Vale Junction | |
| MWA | Milton West Junction to Asfordby Junction Line | ?? | ?? | |
| MWB | Marlow Branch | 0.00 - 2.61 | Bourne End Station | |
| MWC | Mouldsworth and Helsby West Cheshire Junction Branch | 31.05 - 34.77 | Manchester Central | |
| MWD | Market Weighton and Drifield Line | 0.00 - 13.15 | Market Weighton East Junction | |
| MWF | Mossend West Fork | 0.00 - 0.39 | Mossend West Junction | To Mossend North Junction |
| MWJ | Marcheys House Junction to Winning Crossing Junction Curve | 0.00 - 0.31 | Marcheys House Junction | |
| MWL | March West Line | 0.00 - 0.13 | March West Junction | |
| MWM | Middlesbrough West Marsh Line | ?? | ?? | Duplicate of MMH1 |
| MWN | Grimsby Dock Branch (Marsh West Junction to Grimsby Docks) | 107.69 - 108.44 | Manchester London Road via Woodhead | |
| MWT | Margam West Curve | 0.04 - 0.33 | Copper Works Junction | |
| MWY | Mwyndy Branch/Brofiscin Branch | 0.00 - 2.63 | Mwyndy Junction | Formerly 0.47 - 3.30 ex Llantrisant Junction |
| MWZ | Monds Works Loop | 0.00 - 0.13 + works | Mond Works Junction | |
| MYD | Millerhill Junction to Millerhill Yard Junction Line | 0.00 - 0.71 | Millerhill Junction | = MHE ?? |
| MYL | Margam Yard Line | 197.41 - 199.31 | Paddington via Stroud | |
| MYO | Mossend Down Yard | now ZZD1 | ||
| MYP | Mossend Up Yard | now ZZC9 | ||
| MYS | Meadows Yard to Seafield Line | ?? | ?? | |
| MYT | Maryport Elisabeth Dock Line | 0.24 - 0.47 | Maryport Junction ?? | Listed 0.00 - 0.28 |
| MYW | Ministry of Works (Westerleigh East) Loop | 106.43 - 107.04 | Paddington | Formerly WLE |
Introduction A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Lines without codes London Underground system