Inspection pits

[Fluesheet]

Well, someone standing in the pit has to be able to reach the underside of the loco without standing on anything. How far up they have to reach would depend on the locos in question and which bits might need attention. My own feelings is 7 feet to an axle from the bottom, but I've never been down one.
Besides Walthers, models are available from Chooch and Peco.

I've been in one, but it was when I was a kid - and it was deep then!

Another source is Diamond Scale:
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Matt