Williams Baldwin 4-6-0 G Scale Tweetsie Railroad #12 Steamer

[AAA]

Our Museum has received above noted Loco. This is a two rail loco, have searched in earnest to find documentation; however,
only information that I found related to the same loco only based on a three rail system. Looking at the parts diagram, of course they are significantly different. If anyone can provide a source of documentation, would be greatly appreciated.

We would like to add this Loco to our Pioneer Railroad layout which is DCC. Can this loco be converted, and if so, is there a decoder recommendation? It appears the motor is completely isolated, but there are some parts involved which I am not familiar with, looks something like a commutator which is connected in the rail pickup circuit??

Thanking you in advance for your response

Allan
Stony Plain & Parkland Pioneer Museum