If you don't oil your locomotives often enough, gradual wear and tear will eventually turn into quite significant...
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204 H.P. 0-6-0 Drewry Shunter Builds a static model (non-motorised) not intended for conversion. Requires assembly and painting
Deltic Diesel Kit, HO/OO scale
Diesel 0-4-0 industrial shunterType RK 20B