Regarding T&T: check the headlight, safety valve turret, smokestack and driver size. Not a bad guess though.
Regarding Sierra 3, IC 382 or V&T 25: Check any major details on the engine, or the fact that I've already built the 25. 27 is a better guess, but again, check the headlight, safety valve turret, smokestack and driver size.
I'll give some hints: it's Baldwin (which should be evident by looking at it but I know some folks aren't as practiced in their builders), it's not famous, it's not preserved, and it wasn't built with knuckle couplers.
Regarding Sierra 3, IC 382 or V&T 25: Check any major details on the engine, or the fact that I've already built the 25. 27 is a better guess, but again, check the headlight, safety valve turret, smokestack and driver size.
I'll give some hints: it's Baldwin (which should be evident by looking at it but I know some folks aren't as practiced in their builders), it's not famous, it's not preserved, and it wasn't built with knuckle couplers.