Oh dear

Coming home from Leeds yesterday, I noticed something.
Something I’ve seen many many times, but never really looked at before.

A ‘semi-fast’ train.

What the hell does that mean? I know in train terms it means that it was to go from Finchley road to Harrow on the Hill without stopping, but the phrase is so stupid!

Surely semi-fast just means ‘quick’, or ‘nippy’?

What a silly adjective ‘semi-fast’ is.