No. 7, "Sir Nigel Gresley" on the main line.
After a trip to Doncaster to be fitted with a new magnet, Sir Nigel proves that he is a really useful engine...
A mid 1970s, Tri-ang Wrenn A4, Sir Nigel Gresley; newly fitted with a replacement "Super Neo" magnet, shows its worth on the main line. Many thanks to Jon, whose loco it is, for letting me play with Sir Nigel for a while.
Also seen in tonight's episode: Thomas the Tank Engine.