Shotts Line
The Shotts Line is a suburban railway line linking  and  via  in Scotland. It is one of the four rail links between the two cities. Between Glasgow Central and , the line is shared with the West Coast Main Line (WCML), before branching off towards , rejoining the Edinburgh branch of the WCML at Midcalder Junction. The line's electrification was completed in early April 2019. Glasgow to Edinburgh services
The Shotts line does not carry the principal service between the cities, with the journey taking around twice as long as the fast and frequent Glasgow Queen Street-Edinburgh service via Falkirk, which is the premier commuter link between the two cities. History of route
The majority of the route follows ex-Caledonian Railway metals, with the North British Railway at the Edinburgh end. Glasgow Central Lines (CR)
 Polloc and Govan Railway between Eglinton Street Tunnels and  (CR)
 Clydesdale Junction Railway between  and  (CR)
 Cleland and Midcalder Line between  and  (CR)
 Caledonian Railway Main Line between  and 
 Edinburgh and Glasgow Railway between  and  (NBR)

The line was threatened with closure in the Beeching Report of 1963, but was reprieved. Services were diverted from their original terminus at  to Haymarket and Edinburgh Waverley when Princes Street closed in September 1965. The route from Glasgow to Shotts was part of the Strathclyde Partnership for Transport network until it was taken over by First ScotRail. Transport studies
In 2002, the Scottish Association Public Transport (SAPT) published a report suggesting that electrification of the Shotts Line would open up the Glasgow suburban electric network to Edinburgh and beyond, principally linking the capital to the Glasgow Airport Rail Link (now cancelled). This has been proposed as an alternative to the Crossrail Glasgow scheme, since it would not depend on the heavily used North Clyde Line, and would also provide a more direct electric link between Edinburgh and Glasgow without using the longer route via the WCML through Carstairs Junction. Stations 
The Shotts line serves the following stations:

connections for south-west Scotland, including , Greenock and  as well as West Coast Main Line services

only at peak times

 connections to  and . limited connections to 

 connections to north-eastern and central Scotland, including , Stirling and  as well as East Coast Main Line services

Electrification
Network Rail completed an electrification project to electrify the entire line. Prior to the completion of the electrification project, parts of the route were already electrified using the 25 kV overhead system. These were:-
 to 
 to 

The line follows the British Rail electrified West Coast Main Line as far as Uddingston Junction where it branches off to the east. Until Holytown Junction the line used by Argyle Line services. From Holytown the line continues through open countryside past Shotts and joins the Edinburgh Branch of the Caledonian Railway (part of the WCML) at Kirknewton. The central section between Holytown and Midcalder Junction was electrified by April 2019. Train services

Prior to December 2009
A Monday to Saturday hourly service was operated on the line, calling at all stops between Glasgow Central and Edinburgh Waverley. The exceptions to this rule were: Breich which was a request stop at peak hours only, the two trains a day in either direction that travelled via Carstairs and the single afternoon service from Edinburgh via Shotts that terminated at Motherwell. On Sundays only, a two hourly service was provided between Edinburgh and West Calder. There were no services between Addiewell and Bellshill on a Sunday. December 2009 to December 2012
While the original timetabled services on the route continue, albeit slightly altered, they have been supplemented by a new limited stop express passenger service. This new service operates in the gaps in the original timetable, making the route frequency now twice hourly. The new service calls at Glasgow Central, Bellshill, Shotts, West Calder, Livingston South, Haymarket and Edinburgh Waverley only. It will see an end-to-end reduction in journey time of 33 minutes. The journey takes 65 minutes. As of December 2009, the Shotts Line no longer serves Cambuslang, except during peak times. December 2012 onwards
In the December 2012 timetable, the two hourly Sunday service that previously served Edinburgh – West Calder only has been extended the full length of the Shotts line, giving stations between West Calder and Bellshill a Sunday service. One late night service leaves Edinburgh and terminates at Motherwell

CrossCountry

Some services operated by CrossCountry travel over the Shotts Line. Mostly these are empty coaching stock moves to/from Glasgow for driver route retention or passenger services diverted from their usual route via Carstairs due to engineering works or service disruption, but there is currently one service per week which is booked to travel over the line on Saturdays only (2105 Glasgow Central - Edinburgh). This service runs non-stop from Glasgow Central to Haymarket and does not serve any station on the Shotts Line. Traction
From 23 April 2019, ScotRail began operating a limited number of new electric Class 385 trains on the line. Class 156 and Class 158 used to operate on the line before electrification. Freight services along the line are generally hauled using Class 66 traction, though on occasion other types may be used. Bellside Bridge 
Bellside Bridge is situated between Cleland and Hartwood and crosses the A73. It is the most-struck bridge in the country, according to Network Rail in Scotland, being struck 56 times between 2011 and 2021. In August 2021, it was announced that its deck would be replaced with a slimmer version to increase clearance between the road and the bridge. The increased height of the bridge will also allow a signed diversion through Cleland village to be removed. References

Transport in Glasgow
Transport in South Lanarkshire
Transport in North Lanarkshire
Transport in West Lothian
Transport in Edinburgh
Railway lines in Scotland
Standard gauge railways in Scotland