Revolutionary Engines is the third volume of The New Railway Series.
Diesel attempts to pull a megatrain to intimidate Bill and Ben, who have been playing tricks on him in order to drive him out of the Quarry.
Despite being given bad coal, Hiro and Henry try to finish their afternoon run of freight.
During a stormy night, Donald and Douglas tell tales of their work back in their homeland of Scotland.
When the Flying Scotsman returns from Railfest, a visitor named Spencer challenges him to a race to see who's the true fastest engine.