[Pride of Somerset]

Originally Posted by Steam Man

Can anyone clarify for me why mainline locomotives show white vapor when traveling with their dampers shut?

Rob, I have always assumed that it is because they - or at least most of them - use superheated steam - but I may be wrong - commentators often are, I'm told!!!!!

I'm keeping out of discussions on priming, but were not the umbrellas to protect the fair ladies against fallout of the cinder rather than nuclear type??!!