Easy! It's clearly an Isle Of Man Railway 2-4-0T...
The curved running plate is a dead giveaway...
Ed has said he may model the IoMR tanks in the past, so I'm 99% sure it's one of these. What happened to the P2 BTW, you've been a bit quiet on that lately?
Cab is the deadringer for me. Mostly I got the impression that it was a standard-gauge loco rather than 3-foot. Either way, nice work. It's about time we got a complete IoM fleet.