Thanks for the kind words guys

Aestus57, the scale of the loco is 16mm to 1 foot and is gas fired and fully radio controlled (2.4ghz). The cylinders have a 9/16" bore and a 5/8" stroke. The total length of the locomotive over the buffer beams is 430mm and weighs in at modest 5kg.
The hardest part was stopping it doing a wheelie, because of its length and the fact most of the weights at the rear

I had to cobble up a weighbridge, using some track and digital scales, with the loco on the weighbridge I then weighed each axle, whilst trying different rates of compression springs for the rear bogie to keep everything on the rails (not easy). The loco will pull just over 20 pounds with minimal wheel spin, and run for about 45 mins. Glad it's done, but I did enjoy the challenge, right whats next

Cheers
Rob