Street to Southend Victoria was originally electrified at 1,500VDC overhead during the 1940s-50s. During the early 1960s, the whole of this line was converted to 6.25kVAC overhead, while the main line east of Shenfield was progressively electrified at 25kV, with changeover east of Shenfield. During the early 1980s, the line was again converted, this time to 25kV. The Cambridge line and branches from Liverpool Street was electrified in the early 1960s, with 6.25kV out to a changeover at Cheshunt, and 25kV beyond. The Chingford and Enfield lines were thus at 6.25kV throughout. This route was again fully converted to 25kV in the early 1980s. As part of the electrification onwards to Cambridge and Norwich in the 1980s, electric locomotives were transferred to these routes from the West Coast route. These locomotives would not have been able to operate at 6.25kV. Glasgow Suburban network On the North Clyde, the central section between Parkhead and before Dalmuir (Clydebank loop) and Westerton (Anniesland loop) were at 6.25kV, with the outer sections at 25kV. The Bridgeton and Springburn branches were thus at 6.25 kV throughout. The sections electrified at 6.25kV were converted to 25kV during the early 1980s. On the South Clyde, the route from Glasgow Central around the Cathcart Loop was initially at 6.25kV, with changeovers to 25kV at Kings Park and Muirend on the Motherwell and Neilston routes. These lines were progressively converted to 25kV in the 1970s-80s. 3,500 V DC, overhead Bury to Holcombe Brook This was electrified by the Lancashire and Yorkshire Railway in 1913 as part of a trial system for export. The system was converted to third rail in 1918 (see below). 1,500 V DC, overhead (historic) After World War I, the UK Government set up a committee to investigate the various systems of railway electrification; in 1921, it recommended that 1,500VDC overhead should be the future national standard. Several schemes were implemented in its wake, but the Great Depression and World War II meant that very little work was done. Technological advances after 1945 meant that the 25kVAC system was adopted instead for the West Coast Main line and Glasgow suburban electrification (as set out in the BR 1955 Modernisation Plan). However, at the same time, large amounts of money had been (and were still being) spent converting several lines to 1,500VDC. Manchester, South Junction and Altrincham Railway A joint LMS and LNER scheme, it opened on