This 6 wide BR class 37 model has been modified by me from a file by LazarusBricks to have new windows, yellow ends and a sliding center-wheel bogie design derived from an Anthony Sava design.
This is the real life History of class 37: (courtesy of Wikipedia)
As part of the large scale dieselisation brought about by the British Rail modernization plan a need was identified for a number of type 3 locomotives of power output 1,500 hp (1,100 kW) to 1,999 hp (1,491 kW). English Electric had already been successful with orders for type 1 and type 4 diesels, and had produced locomotives of similar power to that which was required for railways in East Africa. A design based on the exported locomotives was put forward and accepted. The design was for a general purpose locomotive and initially found service in British Rail's Eastern Region.
The numbers 6769 are supposed to go above the head and tail lights on each end of the loco. This real-world diesel was supposedly haunted by a driver who was killed when an object, thrown up by a passing Deltic between Northallerton and York, smashed through the window. The horn is said to randomly blow and fire bottles have been set off.