A "nod" to Red Green, didn't go unnoticed, Komachi.
If using balsa wood, might I suggest Elmers Wood putty? Quick drying, no-mess, and cleans up, with water......
I do recall a carrier, in the not too distant past, cutting down all of the Trainmasters, on their roster, and converting them into slugs.
If needed, the trucks could be, created from scratch. The center castings are easily recreated, possibly even by the original supplier. Drop equalizers, are just plate steel, also easily recreated. Journal boxes, springs, etc., all readily available, today. It's NOT really as hard a project, as some of you have attempted to portray it, to be. Steel, is probably the easiest medium to work in, as it can be formed, and reformed, practically forever. Might I "suggest" someone take a few minutes, to verify if this thing is still even there, not gone to the scrappers? Someone on this forum has to live near there..........