Great Western Main Line

The Great Western Main Line (GWML) is a main line railway in England that runs westwards from London Paddington to Bristol Temple Meads. It connects to other main lines such as those from Reading to Penzance and Swindon to Swansea. Opened in 1841, it was the original route of the first Great Western Railway which was merged into the Western Region of British Railways in 1948. It is now a part of the national rail system managed by Network Rail with the majority of passenger services provided by the current Great Western Railway franchise.

Great Western Main Line
Maidenhead Railway Bridge carrying the line over the River Thames.
Overview
StatusOperational
OwnerNetwork Rail
Locale
Termini
Stations25
Service
TypeCommuter rail, Higher-speed rail
SystemNational Rail
Operator(s)
Depot(s)
Rolling stock
History
Opened30 June 1841 (complete line)
Technical
Line length118 miles 19 chains (190.28 km)
Number of tracksFour (London to Didcot),
two (Didcot to Bristol)
Track gauge4 ft 8+12 in (1,435 mm)
Old gauge7 ft 14 in (2,140 mm)
Electrification25 kV 50 hz AC OLE (London to Chippenham)
Operating speed125 mph (201 km/h) maximum
SignallingAWS, TPWS, ATP
Route map

(Click to expandInteractive map)
Great Western Main Line
miles
0
London Paddington
Paddington Goods
Royal Oak ( )
Mileage Yard Goods & Coal
Subway Junction
Westbourne Park ( )
Portobello Junction
Notting Hill Sidings
Kensal Green Gasworks siding
West London Junction
Old Oak Common Goods
Old Oak West Junction
Willesden & Acton Brick Co. siding
Acton Main Line
Ealing Broadway
West Ealing
Hanwell
9
Southall
11
Hayes & Harlington
Airport Junction
to Heathrow Airport stations
14
West Drayton
Staines and West Drayton Railway
to Colnbrook Cargo Centre
14¾
Iver
16¼
Langley
18½
Slough
21
Burnham
22½
Taplow
24¼
Maidenhead
31
Twyford
Sonning Cutting
1 mile (1.6 km) long
60 feet (18 m) deep
Reading East Junction
36
Reading
38¾
Tilehurst
41½
Pangbourne
44¾
Goring & Streatley
Moulsford
48½
Cholsey
Cholsey & Wallingford Railway
(bank holidays and weekends only)
53
Didcot Parkway
Didcot Railway Centre
Steventon
Wantage Road
Challow
Uffington
77¼
Swindon
Dauntsey
Christian Malford Halt
94
Chippenham
Thingley Junction
Corsham
Box Tunnel
2939 yd
2687 m
Box (Mill Lane) Halt
Box
Bathford Halt
Bathford Bridge
over River Avon
Bathampton Junction
Bathampton
Hampton Row Halt
107
Bath Spa
108
Oldfield Park
Twerton-on-Avon
Twerton Tunnel
Saltford Tunnel
Saltford
113¾
Keynsham
St Anne's Park No 3 Tunnel
1017 yd
930 m
St Anne's Park No 2 Tunnel
154 yd
141 m
St Anne's Park
North Somerset Junction
116½
Bristol Temple Meads
Bristol West Junction
Temple Meads Goods

The line is electrified between London Paddington and Royal Wootton Bassett. Work to complete electrification all the way to Bristol was begun in 2011, but in 2016 the UK government deferred electrification of the section through Bath from Royal Wootton Bassett to Bristol, with no date set for completion, because costs had tripled.

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