I was bored on my lunch break, so came up with some more:
Southern, give us a train
Southern, Southern, give us a train
(followed by the inevitable boo when no train turns up)
or
You're just a sh*t British Rail
Sh*t British Rail....
Who's that man with all the power
Who's that man we all DEPLORE
Oh, Chris Grayling is his name
And he F**KED up all the trains
And we can't use Southern anymore
Or something like that