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The Chase Line is a suburban railway line in the West Midlands region of England. It runs from its southern terminus, , to , and then in Staffordshire, where it joins the Trent Valley line. The name of the line refers to Cannock Chase which it runs through at its northern end. Part of the line, between Birmingham and Walsall, has been electrified since 1966; work to electrify the remaining 15 mile stretch of line between Walsall and Rugeley, was completed in December 2018.

Monday to Saturday daytime there are four trains per hour from Birmingham New Street to Walsall. Two per hour run via and call at all stations, the other two per hour run direct via Soho and call at Tame Bridge Parkway and Walsall. Two of these per hour continue to Rugeley Trent Valley during the day, dropping to one in the late evenings. There is also a 6am service from Wolverhampton to Rugeley Trent Valley but this is only one way. It runs the entire Birmingham to Walsall section calling at all stations them onto the Chase Line. As of May 2019, following the electrification of the line north of Walsall, West Midlands Trains began operating 2tph (Mon–Sat) from Rugeley Trent Valley to Birmingham International with 1tph continuing to Northampton or London Euston. On Sundays, all services from Rugeley terminate at Coventry. All services are operated by EMUs, Track is Shared with the Cross City Line between and .

The lines between New Street and Walsall were electrified in 1966 as an offshoot of the West Coast Main Line electrification, along with the Walsall–Wolverhampton line. In July 2012, the coalition government announced the electrification of the Chase Line between and , with work scheduled to take place from 2014. It was estimated to cost around £36 million, as part of a £9.4 billion package of investment in the railways in England and Wales, including £4.2 billion of new schemes, unveiled by the government. Preliminary work to re signal the route ahead of electrification was completed in August 2013, with the closure of the three remaining manual signal boxes at Bloxwich, Hednesford & Brereton Sidings and the panel boxes at Walsall & Bescot. Control of the area passed to the Saltley Rail Operating Centre. The work originally had an estimated completion date of December 2017, but previously unknown mine shafts underneath the track meant that many bases for the overhead infrastructure had to be redesigned. Network Rail closed the line in August 2017 for two weeks. The electrification was finally completed in December 2018,

The electrification of the line was accompanied by a speed increase from to Bloxwich level crossing closed to motorised traffic in January 2018, and the bridge at Central Drive, north of the crossing, had been strengthened and widened to improve the alternative route. This enabled a speed limit to be lifted to It also enabled the line to transport W10 freight containers. For residents of the stations north of Walsall, the changes meant shorter journey times and longer trains, which reduced overcrowding to Birmingham with 2 trains per hour (tph) for the whole day, continuing direct to Birmingham International (1tph). The electrification itself created over 1,300 jobs in the area and generated a further £113 million of gross value added (GVA) benefit per annum, as well as reducing the operating costs of the line. In May 2014, London Midland announced that it was intending to run longer trains on the route, requiring station platforms to be extended to accommodate. Gavin Williamson, Conservative MP for South Staffordshire, campaigned to limit the speed of trains through Great Wyrley and Cheslyn Hay when the upgrade work of the line was to be completed. He wrote to then Transport Secretary Patrick McLoughlin, to request confirmation that trains travelling through the areas would not exceed a speed of 45 mph. He also requested that "environmental mitigation measures" be put in place to reduce the potential impact of the electrification on residents in South Staffordshire. Network Rail had previously said that electric trains are quieter, greener and cleaner, reducing carbon emissions.