 For a while in the late 1950s and 1960s the line was the only route from Waterloo that had 4SUB units substituted by EPB units.For many years new train stock was tested for long periods on this route.New mainline 4LAV units were tried out in public service in the spring of 1932 on the Waterloo – Cobham – Guildford route, where a publicity shot was taken of a unit carrying headcode H with a bar above, the original route code for the line.