mirror, but as these proved dangerous in service they were soon replaced with normal advertising. The other fittings were a chain alarm-cord in a recess above and to one side of the door, and the door-lock itself, a simple spring-loaded slide: the slam-doors could be opened at speed, albeit at considerable risk to the passenger doing so. The door window could also be opened full-length into a recess in the door panel beneath, initially supported at the bottom by a leather strop, which was soon replaced by a metal friction-bar at the top, bearing on the side-rails – in general they were either closed or with a one- or two-inch opening. The flooring was a strong linoleum on wooded baulks: the linoleum was not present in the guards compartments, which together with the cabs were painted in a dark green. A mirror to a roof periscope facing along the length of the unit was fitted centrally to the guard's side of the rear compartment partition, together with a handle for the sweep-arm cleaner of the roof glass. Underneath was a small worksurface about 2'x1', a swivel-chair screwed to the floor, and variously a short ladder for evacuating coaches, sometimes a medical cabinet, and a rail-shorting bar would be fixed to the side of the compartment. The driver's cab was fitted with one flap-down seat on each side: the driver occupied the left-hand position. Summary of sub-classes 415/1 – unrefurbished 4EPB stock of Southern design, built 1951–57, numbered in the 50xx, 51xx and 52xx series. 415/2 – unrefurbished 4EPB stock of BR design, built 1960–63, numbered in the 53xx series. 415/4 – refurbished 4EPB stock of Southern design (from 1980), numbered in the 54xx series. 415/5 – Consolidated compartment 4EPB stock of both designs, numbered in the 55xx series. 415/6 – refurbished 4EPB stock of BR design, numbered in the 56xx series. 415/7 – refurbished 4EPB stock of BR design, with express gearing to 90 mph. These units retained *56xx series numbers. Accidents and incidents On 9 August 1957 car 14450 of unit 5225 was destroyed in the Staines rail crash. In 1958 it was replaced by 14407 from 5204. On 4 December 1957 car 14408 of unit 5204 was destroyed in the Lewisham collision. The unit was disbanded and the remaining cars later used in other units. On 4 July 1958, 5023 was in a head-on collision with an empty