Agreed.
HST: Class 91 locomotive with mark 4 vehicles and DVT, classes 158, 159, 168, 170, 171, 172, 175, 180, 220, 221, 222, 253, 254 and 373
MU: Multiple Unit Trains
DMU: Diesel Multiple Units
EMU: Electrical Multiple Units
SP: Classes 150, 153, 155, 156, 158, 159, 165, 166, 168, 170...