This is a good series (last one tonight 9pm) following numerous preserved standard and narrow gauge lines: East Lancs, Great Central, Welsh Highland/Ffestiniog, Dart Valley, South Devon. Although it's focusing on 'personalities', there's still good explanations of firing, driving and maintaining steam locos. Tonight's is the last of 4 progs, but they're on catch-up, of course.
Steam Train Britain | Yesterday Channel
Apologies to non-UK readers if you can't access this link.
Steam Train Britain | Yesterday Channel
Apologies to non-UK readers if you can't access this link.