Pretty sure it's 1/48 and it's just a rather large 0-8-0.
Host of articles in the model RR'ing lit on modifications and kit bashing - just about anything and everything possible was done. 2-8-2's & 2-8-0's were fairly common, but I recall seeing at least one 2-8-8-0(2?). Search RMC and/or MR.