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

comprised a pair of prototype units

They were also the last units to run on the Anglesey Central Railway which closed to public traffic in 1964

but is likely to return in the future

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.