"Paul Scott" wrote in message
...

c) I saw a 317 pull into the station. Where would that train have come
from and why would it be operating on Thameslink? I thought that they
would exclusively run 319s.

Moorgate, but don't know the details of how and why.

I thought that FCC would run be running 317s out of the other terminal at
Moorgate, via Finsbury Park and Welwyn Garden City.

BTW, are those 317s equipped with tripcocks?