Had's McCulloch Chainsaw Shop -- Monster Models Triple J

[Mr Fixit]

This business might require a sound module of some sort, with chainsaws being briefly started up for an engine check, cursing when someone skins their knuckles during a repair, that sort of thing.
To tie the business into the local railroad you could have the track crew truck out front bringing in a chainsaw and a brush cutter or two for service/repair after a serious fight with the local track side vegetation.

Mark