Well, it sounds like a bit of an unknown gem in these here parts o' the shire.
The train is run by the Welling & District M.E.S. (model engineering society to us common folk), and it sounds like they'll be evicted from the Falconwood site next year. Boo. Here are the open days:-
14th & 28th June 2009
12th & 26th July 2009
9th & 23rd August 2009
6th & 20th September 2009
4th October 2009
They aren't open the public apart from these dates, so do go along sooner rather than later as you know you'll just keep saying 'ah, I'll go next fortnight', and so on and so on until it's 5th October and that's it. Gone forever.
On these days, they open between 2pm - 5pm. Last orders at 4.30pm.
Here's a funny new-fangled map to locate the train.
View Welling & District M.E.S. in a larger map