B-B Diesel
R55 "A" Unit with Cab R58 "B" Unit without Cab
1958 Catalogue Illustration
The "A" Unit was also sold without a motor as a Dummy Unit R57. The early model had a silver Cab, on later versions the whole Cab was painted Red.
A variety of legends carried, the early models had a Maroon stripe, on the later ones it was Red.