Thanks guys!
juergen: That's very cool, and I never saw that movie, thanks for the hint - I'll check it out!
FifteensAway: The mortar car is scratch built; I bought some TT gauge axles and made the car out of balsa wood and match sticks. The mortar is from QRF/Freikorps 15, who have an incredible range of ACW artillery. The car is based on this one:

My model was actually a test piece for building a genuine railway gun, but I haven't started yet...
The colour of the engine is based on a drawing in the Osprey on
American Civil War Railroad Tactics - engines were painted in quite garish colours at the time. I could barely resist painting mine red and putting 'Hogwarts Express' on the signs

I've been following your thread over in the Old West forum - do you know of a European distributor for the Glencoe kits? Postage is absurd if i order from the US…
Cheers