Whilst not generally condoning graffitti per se, there used to be one on the tunnel wall just where the Bank home signal was in BR days, probably written by drivers waiting for the road.
Maybe some of the present drivers on the line have seen it an wonder what it's all about. Let me explain:
It started with "to do is to be, and to be is to do-William shakespeare" Followed by "doobie doobie doo, Frank Sinatra". Under that was "doome doome doo-Terry Wadsley".
Now, the first 2 are self-explanatory. The third, well, Terry Wadsley was a driver at Waterloo who lived at Peterborough. On late shift, he was always trying to get someone else to cover his last trip, hence the nickname "doo-me", as "can you do me last bit".
But to add to that was the fourth bit, "Debbie Debbie doo-Glen Webber".
This was reference to a guard Debbie Matthews who worked on the W&C, and her bloke at the time, Glen Webber!