Diesel engine (x2) Maybach MD 655. Length (over buffers) 68' 0"
Horsepower (engine) 1,380 @1530 rpm Width (over body) 9' 0"
Horsepower (loco) 2,760 hp Height (body height) 12' 117/8"
Cylinder bore diameter 7¼" Height (over walkways) 13' 1"
Cylinder stroke 8¼" Wheel diameter (new) 3' 7"
Transmission (x2) Voith L630rv Wheelbase (bogie) 12' 2"
Horsepower (input) 2,540 hp Wheelbase (overall) 54' 8"
Convertor change 1st to 2nd @40/42 mph Wheelbase (centre axles) 42' 6"
2nd to 3rd @60/62 mph Wheel arrangement C-C
Tractive effort 72,6000 lbs @ 27.6% adhesion (starting) Fuel capacity 840 gallons
Tractive effort 45,200 lbs @ 14.5 mph (continuous) Fuel capacity (dual brake) 714 gallons
Final drives (x6) C33v Weight 108 tons
Cooling fan speed 1,725 rpm Weight (dual brake) 109 tons
Cooling fan diameter 42½" Weight (empty) 101 tons 12 cwt
Brake force 82 tons
Train heating Spanner Mk III boiler (steam) Brake force (%) 75.87% loco weight
Water capacity 980 gallons Maximum speed 90 mph
Water capacity (dual brake) 800 gallons Route Availability R A 6
Steam capacity 1,500 lb/h Minimum radius curve 4½ chains
The above specifications are based on a locomotive in 100% condition. Calculations show that the theoretical maximum speed of a class 52 locomotive with outputs set at the maximum rating is 122 mph. Full engine speed in 2nd convertor is normally around 1450 rpm reducing the average total horsepower output of the locomotive by around 50 hp.
In order to comply with current regulations D1015 has undergone several modifications as follows -
DVD Drivers Vigilance Device This device requires the driver to release the Deadmans pedal every 60 seconds and reset the pedal to ensure the driver remains alert.
SSF Speed Sensing Fitted This device applies the brakes should the driver select 'Engine Only' or 'Off' on the direction selector when the locomotive is moving. Should the loco run away unattended this same device detects this and applies the brakes.
NRN National Radio Network Locomotive to land line radio telephone system.
------ Windscreen washers Only ever fitted to Class 52 during tests in traffic D1015 has been fitted with wiper mounted air operated water jets for windscreen cleaning.
AIDS Anti-Idiot Driver System. This DTG devised modification prevents the driver taking power with a handbrake applied in any cab. When the power handle is put to 'on' and a handbrake is on in either cab the fire bells ring.
During the careers on B.R. if the A engine shut down on any Thousand the electrical feed to the big compressor, fitted during air braking, was lost and the loco was unable to create enough air pressure to work air braked trains. On D1015 the compressor wiring circuits have been modified to allow B engine to electrically feed the big compressor if A engine fails, thus improving reliability.