Nicked from the web by googling t478.1 (the old class number from Czechoslovakian days)
http://techmag.valka.cz/zel_p_751.htm
Engine: Type - six-cylinder turbocharged diesel
type - The 6 S 310 DR
Number of cylinders - 6 V-
Bore / stroke - 310 / 360 mm (162 litres)
speed - 750 rpm / min
power - 1102 kW (1500hp) (980kW at traction motors)
Drivetrain: Electric AC / DC
Type of traction dynamo: TD 802 C
Type of traction motors: TE 005 C
The locos are listed as being built by CKD Praha, presumably the engines were built in house.
HTH