GWR operate most long-distance services between London and destinations such as , , , , , Swansea, , (summer), , (summer), , , , , Plymouth and Penzance, using its large fleet of 58 HST "InterCity 125" sets [REF].
After a successful trial by Angel Trains and FGW in 2004, two power cars received new MTU engines while two received new Paxman/MAN VP185s, fitted by Brush Traction of Loughborough.