Trainspotting

As part of an email conversation I had yesterday, this came from a colleague. It is the funniest thing I saw all day and great to think that we can laugh at ourselves:

Right end of really great day doing detailed low level accountancy work.

Just going to do a bit of train spotting at Clapham Junction. Flask, sandwiches and notebook in hand.

I better take my coat just in case it rains.

I wonder if it is in response to something I said?