Application of the dart RD7 free spool gas turbine engine to the advance passenger train (TN-APT-012)

The ideal tractive shaft power requirements for the two axles of each APT power coach is 1.1 MW (1 500 hp). However, in assessing the Rolls Royce Dart RD7 free spool gas turbine engine for rail traction, the worst conditions of its employment should be considered.