Broken Viking
On Moderation
Can ye yay or nay my Cambridge, sil-vous-plait? 
Thought of the day: Is 300 pages on a thread getting a bit out of had?
The station signs are definately Southern Region.
Firstly can you confirm that it is Farningham Road (& Sutton at Hone) which I am 99%sure but maybe 1% unsure
It would appear then to be a Gravesend West branch train hauled by H class 0-4-4T which is taking water. The reason it appears to be working wrong line is possibly that it could be a push pull auto train with the loco at the rear.