B604 4 Light Signal Red/Green/2 X Yellow Standard Square Head MK2-Coach a 1st / 2nd (later

a 1st / 2nd (later declassified to 1st/ 3rd) Lavatory Composite and Brake Third

Twin Smokebox-mounted Lubricators

Other members of the class were given names of regiments or had military connections

comprised a pair of prototype units

but no full brakes

B604 4 Light Signal Red/Green/2 X Yellow Standard Square Head MK2-Coach a 1st / 2nd (later4 light signal red green 2yellow standard square head This 4 aspect signal is placed at the side of the track. A red light indicates stop, a double yellow light indicates caution the next signal is yellow and at caution, a single yellow light indicates caution the next light is red and Green indicates permission to proceed or route clear. . It is suitable for any layout based from around 1970 onwards, when this style of signal head came into use.