The lines are double track for most of its length, however between Hackney Downs and Liverpool Street it is multitrack – the "suburban lines" for trains stopping at Bethnal Green, Cambridge Heath and London Fields and the "Main Lines" for non-stop West Anglia/Stansted Express services. It is electrified at 25 kV AC using overhead line equipment and has a line speed of 40–75 mph except between Cheshunt and Coppermill junction where it is 60–85 mph. Different sections have different loading gauges. Most is W8, with the branches to Enfield Town and Chingford being W6 and the branch to Stratford W9.