[QUOTE="M"] I watched Night Mail and a fiftieth anniversary version last week (highly recommended), but I don't understand one thing. In both of them, they changed engines in the Midlands. I could understand that in the days of coal and water you might want to change engines rather than wait for a reload, but why were they doing it in 1986?[/QUOTE] I found it quite amusing that the trains from/to France/Spain had to stop midway for a gauge change. I think they have more clever expandable/shrinkable width jobs these days though.