This is an useful example / addition from around 1963 of The Triang Transcontinental diesel headlight assy and the bracket to fit on the top of the motor unit all as per the photo and title. Bulb tested -.
TRIANG B0-B0 DIESEL LOCO POWER BOGIE 1960 transcontinental R253 R353 gc
Triang Hornby R253 / R353 Dock Authority Shunter bogie without motor
TRIANG R253 Diesel Dock Shunter No5 "Dock Authority" and 7No Wagons as listed
NON RUNNER TRIANG R253 DOCK AUTHORITY SHUNTER BLACK NO3 GOOD UNBOXED LOCO OO
Hornby Triang R253 OO Gauge Dock Authority Diesel Shunter #3 1970's Good Usable
Triang Hornby R253 Dock Authority Shunter Headlight Surround Resin Replacement