Departmental Units
Over the years many vehicles saw departmental use in a wide range of duties: research, route learning, sandite, even mess coaches. Here is a list of those vehicles and their use where known.
The prefixes indicating owning department are also shown where known, although these were not necessarily carried. The meaning of these are: ADB Regional Mechanical and Electrical Engineer; DB Regional Civil Engineer; RDB Research Department; TDB Traffic Department.
As always, if there are any errors, omissions, additions, etc., please let me know.
| Dep. No. | Original No. | Class | Type | Name / Use |
| 975003 (RDB) | 79998 | BMU | DMBS | Laboratory 16 "Gemini" |
| 975004 (RDB) | 79999 | BMU | DTC | Laboratory 16 "Gemini" |
| 975005 | 50416 | Wickham | DMBS | General Managers Saloon |
| 975006 | 56171 | Wickham | DTC | General Managers Saloon |
| 975007 (DB) | 79018 | DL | DMBS | Ultrasonic Test Train |
| 975008 (DB) | 79612 | DL | DTC | Ultrasonic Test Train |
| 975010 (RDB) | 79900 | DL | DMBS | "Iris" Radio Tests |
| 975012 | 79185 | DL | DMBS | Brake trials test coach |
| 975013 | 79250 | DL | DTS | Staff messroom, Craigentinny |
| 975014 | 79252 | DL | DTS | Staff messroom |
| 975018 | 79047 | EMC | DMBS | Lab 21 Plasmar Torch research |
| 975019 | 79053 | EMC | DMBS | Lab 21 Plasmar Torch research |
| 975023 (TDB) | 55001 | 122 | DMBS | Route Learner |
| 975042 (TDB) | 55019 | 122 | DMBS | Route Learner |
| 975089 (RDB) | 50396 | 103 | DMBS | Rail Top "Trim" Lab Coach 5 - Track recording Car |
| 975090 (RDB) | 56162 | 103 | DTC | Rail Top "Trim" Lab Coach 5 - Track Recording Car |
| 975137 | 50397 | 103 | DMBS | Viaduct Inspection Unit No.1 |
| 975227 (TDB) | 55017 | 122 | DMBS | Route Learner |
| 975228 | 56160 | 103 | DTC | Viaduct Inspection Unit |
| 975309 | 55008 | 122 | DMBS | Route Learner |
| 975310 (TDB) | 55010 | 122 | DMBS | Route Learner |
| 975327 (DB) | 59828 | 123 | TSRB | WR RCE staff & dorm coach for rail profiler DX79105 |
| 975348 | 51115 | 100 | DMBS | Route Learner |
| 975349 (DB) | 51116 | 100 | DMBS | RCE Inspection Saloon |
| 975385 (RDB) | 55997 | 129 | DPU | Laboratory Coach 9 "Hydra" |
| 975426 | 79098 | 126 | DMBS | Mess coach |
| 975539 (DB) | 56101 | 100 | DTC | RCE Inspection Saloon |
| 975540 (TDB) | 55016 | 122 | DMBS | Route Learner |
| 975637 (DB) | 56300 | 100 | DMBS | RCE Inspection saloon, ER General Managers Saloon |
| 975659 (TDB) | 55035 | 121 | DMBS | Route Learner |
| 975664 (DB) | 51122 | 100 | DMBS | RCE Inspection saloon, ER General Managers Saloon |
| 975874 | RB | LEV1 | ||
| 975964 (RDB) | 59466 | 125 | TS | Storage coach at ZD, fire test coach |
| 975993 (RDB) | 59458 | 125 | TS | Fire Tests coach |
| 975994 (TDB) | 55014 | 122 | DMBS | Test & Stores car for Class 150 units |
| 975998 | 55013 | 122 | DMBS | Route Learner |
| 977020 | RB | R3 | ||
| 977047 (ADB) | 56156 | 103 | DTC | Sandite |
| 977048 (ADB) | 56142 | 105 | DTC | Sandite |
| 977049 (ADB) | 56474 | 105 | DTC | Sandite |
| 977050 (ADB) | 56448 | 105 | DTC | Sandite |
| 977051 (ADB) | 56427 | 105 | DTC | Sandite |
| 977052 (ADB) | 56145 | 105 | DTC | Sandite |
| 977114 (ADB) | 56129 | 105 | DTC | Sandite |
| 977123 (TDB) | 51286 | 105 | DMBS | Driver training / route learning |
| 977124 (TDB) | 51296 | 105 | DMBS | Driver training / route learning |
| 977125 (TDB) | 56444 | 105 | DTC | Driver training / route learning |
| 977126 (TDB) | 56445 | 105 | DTC | Driver training / route learning |
| 977177 (TDB) | 55015 | 122 | DMBS | Driver training / route learner / sandite |
| 977191 (ADB) | 56106 | 100 | DTC | Crewe diesel loco test train |
| 977196 (TDB) | 56111 | 100 | DTC | Special Instruction coach |
| 977223 (TDB) | 55007 | 122 | DMBS | Driver training / route learner / sandite |
| 977225 (RDB) | 52014 | 107 | DMC | Laboratory coach |
| 977226 | 59787 | 107 | TS | Laboratory coach |
| 977227 | 52032 | 107 | DMC | Laboratory coach |
| 977342 | 50475 | 104 | DMBS | Carriage Washing Test Coach |
| 977343 | 50506 | 104 | DMC | M&EE Test Unit |
| 977344 | 50422 | 104 | DMBS | RTC use - M&EE Test Unit |
| 977391 | 51433 | 101 | DMBS | Ultrasonic Test Train |
| 977392 | 50167 | 101 | DMBS | Ultrasonic Test Train |
| 977393 | 50246 | 101 | DMBS | Ultrasonic Test Train (not used) |
| 977453 (TDB) | 51260 | 105 | DMBS | Driver training / route learning |
| 977454 | 56440 | 105 | DTC | Route Learner |
| 977466 | 56286 | 121 | DTS | Sandite |
| 977486 | 56285 | 121 | DTS | Sandite |
| 977535 | 50259 | 101 | DMBS | Sandite / route learner |
| 977536 | 50295 | 101 | DMBS | Sandite / route learner |
| 977537 | 50320 | 101 | DMBS | Sandite / route learner |
| 977538 | 50134 | 111 | DMBS | Sandite / route learner |
| 977539 | 50135 | 111 | DMBS | Sandite / route learner |
| 977540 | 50137 | 111 | DMBS | Sandite / route learner |
| 977554 (ADB) | 56182 | 104 | DTC | Sandite |
| 977555 (ADB) | 56183 | 104 | DTC | Sandite |
| 977607 | 51464 | 101 | DMBS | Sandite / route learner |
| 977608 | 51525 | 101 | DMC | Sandite / route learner |
| 977611 | 51824 | 110 | DMBC | Sandite |
| 977612 | 51838 | 110 | DMC | Sandite |
| 977613 | 51826 | 110 | DMBC | Sandite |
| 977614 | 52076 | 110 | DMC | Sandite |