GWR passenger coaches were many and varied, ranging from four- and six-wheeled vehicles on the original broad-gauge line of 1838, through to bogie coaches up to 70 feet (21 m) long which were in service through to 1947 and beyond. Vacuum brakes, bogies and through-corridors all came into use during the nineteenth century, and in 1900 the first electrically lit coaches were put into service. The 1920s saw some vehicles fitted with automatic couplings and steel bodies.