.... oh you British !
The closest I could find to you loco, & from the numbers mostly visible in your first pix is
http://www.trainshoppe.com/cgi-bin/page2?Rec=3883Your pix looks more like 2054 but there h'ain't such a beast so it must be the 2055 with ther Wachart(sp) gear & links half way back the drivers.
And I think you have the 2046W tender instead of the one in the url photo.
Yes, it's the 2055 Loco and the tender could be from my other loco as the whistle in this one worked better. I brought them both out and used the best of the lot for get us railroading in time for Christmas. A little Cramolin R-5 on the track and wheels and away it went.
73
Paul