The Midland Main Line (MML) is a major railway line between and , via , and ; a spur of the line terminates at .
Express passenger services on the line are operated by East Midlands Railway. The line is electrified between St Pancras and Wigston, south of Leicester, and the section south of forms a branch of the northern half of the Thameslink network, with a semi-fast service to and other suburban services. A northern part of the route, between Derby and Chesterfield, also forms part of the Cross Country Route operated by CrossCountry. Tracks from Nottingham to , via Barnsley and Sheffield, are shared with Northern Trains. East Midlands Railway also operates regional and local services using parts of the line.
The Midland Main Line was undergoing a major upgrade of new digital signalling and full line electrification from London to Sheffield but this was indefinitely paused in 2025. High Speed 2 was planned to branch onto the Midland Main Line at .
History Midland Counties early developments
The Midland Main Line was built in stages between the 1830s and the 1870s. The earliest section was opened by the Midland Counties Railway between Nottingham and Derby on 4 June 1839. On 5 May 1840, the section of the route from Trent Junction to Leicester was opened.
The line at Derby was joined on 1 July 1840 by the North Midland Railway to Leeds Hunslet Lane, via Chesterfield, Rotherham Masborough, Swinton and Normanton.
On 10 May 1844, the North Midland Railway, the Midland Counties Railway and the Birmingham and Derby Junction Railway merged to form the Midland Railway.
Midland Main Line southern extensions Without its own route to London, the Midland Railway relied upon a junction at , with the London and Birmingham Railway line for access to the capital at . By the 1850s, the junction at Rugby had become severely congested. The Midland Railway employed Thomas Brassey to construct a new route from Leicester to , via , and Bedford. This gave access to London via the Great Northern Railway from Hitchin. The Crimean War resulted in a shortage of labour and finance; only £900,000 () was available for the construction, approximately £15,000 for each mile (. To reduce construction costs, the railway followed natural contours, resulting in many curves and gradients. Seven bridges and one tunnel were required, with cuttings at Desborough and Sharnbrook. There are also major summits at Kibworth, Desbrough and at Sharnbrook, where a 1 in 119 gradient from the south over takes the line to above sea level. This route opened for coal traffic on 15 April 1857, goods on 4 May, and passengers on 8 May. The section between Leicester and Bedford is still part of the Midland Main Line.
While this took some of the pressure off the route through Rugby, the GNR insisted that passengers for London alight at Hitchin, buying tickets in the short time available, to catch a GNR train to finish their journey. James Allport arranged a seven-year deal with the GN to run into Kings Cross for a guaranteed £20,000 a year (). Through services to London were introduced in February 1858.Davies, R.; Grant, M.D. (1984). Forgotten Railways: Chilterns and Cotswolds. Newton Abbot, Devon: David St John Thomas. , p. 110–111.
This line met with similar capacity problems at Hitchin as the former route via Rugby, so a new line was constructed from Bedford to , via which opened on 1 October 1868. The construction of the London extension cost £9 million (equivalent to £ million in ).
As traffic built up, the Midland Railway opened a new deviation just north of on 26 June 1885, to remove the flat crossing of the Rugby and Stamford Railway.Radford, B., (1983) Midland Line Memories: a Pictorial History of the Midland Railway Main Line Between London (St Pancras) & Derby London: Bloomsbury Books
Northernmost sections
Plans by the Midland Railway to build a direct line from Derby to Manchester were thwarted in 1863 by the builders of the Buxton line, who sought to monopolise on the West Coast Main Line.
In 1870, the Midland Railway opened a new route from Chesterfield to Rotherham which went through Sheffield via the Bradway Tunnel.
The mid-1870s saw the Midland line extended northwards through the Yorkshire Dales and Eden Valley, on what is now called the Settle–Carlisle Railway.
Before the line closures of the Beeching era, the lines to and via presented an alternative (and competing) main line from London to Manchester during most years, carrying named expresses such as The Palatine and the Blue Pullman diesel-powered Manchester – London service (the Midland Pullman). Express trains to Leeds and Scotland such as the Thames–Clyde Express mainly used the Midland's corollary Erewash Valley line, returned to it and then used the Settle–Carlisle line. Expresses to , such as The Waverley travelled through and Nottingham.
Under British Railways and privatisation Most Leicester-Nottingham local passenger trains were taken over by diesel multiple units from 14 April 1958, taking about 51 minutes between the two cities. When the Great Central Main Line closed in 1966, the Midland Main Line became the only direct main line rail link between London, the East Midlands and parts of South Yorkshire.
The Beeching cuts and electrification of the West Coast Main Line brought an end to the marginally longer London–Manchester service, via the Hope Valley Line and Sheffield.
In 1977, the Parliamentary Select Committee on Nationalised Industries recommended considering electrification of more of Britain's rail network; by 1979, BR presented a range of options that included electrifying the Midland Main Line from London to Yorkshire by 2000. By 1983, the line had been electrified from to Bedford, but proposals to continue electrification to Nottingham and Sheffield were not implemented.
The introduction of the High Speed Train in May 1983, following the Leicester area resignalling, brought about an increase of the ruling line speed on the fast lines from to .
Between 2001 and 2003, the line between Derby and Sheffield was upgraded from to , as part of Operation Princess, the Network Rail-funded cross-country route upgrade.
In January 2009, a new station, , was opened between and Trent Junction, to act as a park-and-ride station for suburban travellers from East Midlands cities and to serve nearby East Midlands Airport.
Since then, running has been introduced on extended stretches. Improved signalling, an increased number of tracks and the revival of proposals to extend electrification from Bedford to Sheffield have contributed to this. Much of this £70 million upgrade, including some line speed increases, came on-line on 9 December 2013 (see below). As of April 2025, the line has been electrified from London St Pancras to Wigston South Junction.
Network Rail route strategy for freight (2007) Network Rail published a Route Utilisation Strategy for freight in 2007; over the coming years, a cross-country freight route will be developed enhancing the Birmingham to Peterborough Line, increasing capacity through Leicester, and remodelling and Wigston junctions.
Network Rail 2010 route plan
Traffic levels on the Midland Main Line are rising faster than the national average, with continued increases predicted. In 2006, the Strategic Rail Authority produced a Route Utilisation Strategy for the Midland Main Line to propose ways of meeting this demand; Network Rail started a new study in February 2008 and this was published in February 2010.
After electrification, three North Northamptonshire towns, Wellingborough, Kettering and Corby, now have an EMR Connect service into London St Pancras. North Northamptonshire is a major growth area, with over 7,400 new homes planned to be built in Wellingborough and 5,500 new homes planned for Kettering.
Highlights include: Work related to line speed increases, removing foot crossings and replacing with footbridges Capacity enhancements for freight Resignalling of the entire route, completed in 2016, when all signalling will be controlled by the East Midlands signalling centre in Derby Rebuilding Bedford and Leicester stations Accessibility enhancements at , , Loughborough, , Luton and by 2015 Upgraded approach signalling (flashing yellow aspects) added at key junctions – Radlett, Harpenden and Leagrave allowing trains to traverse them at higher speeds Lengthening of platforms at Wellingborough, Kettering, Market Harborough, Loughborough, and stations as well as work related to the Thameslink Programme (see below) Realignment of the track and construction of new platforms to increase the permissible speed through Market Harborough station from 60 mph to 85 mph saving 30–60 seconds Electrification (see below) Redoubling the Kettering to line between Kettering North Junction and Corby; resignalling to Syston Junction via Oakham, allowing a half hourly London to Corby passenger service (from an infrastructure perspective) from December 2017; and creating additional paths for rail freight.
Thameslink Programme
The Thameslink Programme has lengthened the platforms at most stations south of Bedford to 12-car capability. St Pancras, , and were already long enough, but bridges at mean it cannot expand beyond the current 8-car platform length. has a new footbridge and a new station building. In September 2014, the current Thameslink Great Northern franchise was awarded and trains on this route are currently operated by Greater Thameslink Railway. In 2018, the Thameslink network expanded when some Southern services merged into it.
Station improvements In 2013/14, Nottingham station was refurbished and the platforms restructured.
As part of the Stanton Cross development, Wellingborough station is to be expanded."Wellingborough railway station expansion plan unveiled". BBC News. 18 April 2012. Retrieved 23 August 2013.
station, between Nottingham and , was opened on 2 April 2017.
Two new stations were planned: between Cricklewood and Hendon, as part of the Brent Cross Cricklewood development in North London. It opened in December 2023.Brent Cross Cricklewood: Transport Retrieved 23 August 2013 , between and Bedford, as part of the new town. Construction has been pushed back repeatedly; it was first expected to be built by 2015,The Wixams: Transportation Retrieved 23 August 2013 then for 2019, the government confirmed in April 2025 that main construction would begin in concert with the nearby Universal United Kingdom Theme Park in 2026, although groundwork had already begun by late 2024.
Some new stations have been proposed: Clay Cross between Chesterfield and Ambergate/Alfreton. Irchester () between Wellingborough and Bedford. Ampthill between Bedford and Flitwick.Bedfordshire Ampthill station , Railway & Transport Association. Retrieved 4 January 2010.
Extension of electrification
Unlike the West and East Coast Main Lines, the Midland Main Line has not been electrified along its full length. The line was electrified as far as Bedford in the early 1980s, but services have relied on diesel traction beyond that.
In 2011, work commenced to extend the electrification, including to both Corby and Nottingham. Increasing costs initially saw this terminated at Kettering in 2017 but, in 2021, work began on extending electrification to Market Harborough and onwards to Wigston with plans to extend further to Sheffield. The section was energised on 28 July 2024 and completed testing in April 2025.
In May 2022, a briefing to contractors was released ahead of an invitation to tender for Midland Main Line Electrification project work to extend electrification to Nottingham and Sheffield. This scheme is expected to cost £1.3 billion.
In July 2025, the Department for Transport put plans for further electrification on hold indefinitely.
2021 Integrated Rail Plan