These guys could use one:
Model Railroader magazine, April Fools article, 1978.
Cheers,
Colin
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Would this qualify?
The more I think about it, probably not as it’s not an inspection vehicle. Would been a better question for the other Rail campaign that just ended.
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Whoa! “Pole Road” wheels. Well if it does not qualify then I don’t know who would volunteer to be one to tell it that 
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Wow!!! Holy Smoke, beat that for inventive problem solving.
That Mack on those super-wide rims is just gorgeous!
That certainly warrants a model.
Suggestion: Invent a rail inspection/servicing/maintenance truck.
Maybe they had one even if there isn’t a photo of it …
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How close are we keeping to the “inspection” part of the rules? Seems we’ve got a number of working rail vehicles being proposed, but used to move stuff rather than just check on the railway…
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I agree, I like that the “rails” are logs making it unique.
Found a thread that talked about using this pulleys for the wheels.
Not sure what the rear/trailer would look like. Might have to make some guesses.
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Never heard of those two (three?) words used together. 
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This looks inspectiony…
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I’m thinking of these critters.
This is my first choice:
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Interesting….
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Lots of good rail car/truck ideas here:
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I love the Rowland Emett stuff but building a Track Inspection Vehicle for it would be… interesting. Something like this might be a starting point…
Regards,
M
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Found another source for G parts: Trucks
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Did someone mention a zepplin train?
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IIRC there was a HO-scale running model of the Zep from one of the German makers - Marklin? Fleishmann?
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Märklin it was.
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A better video of the Schienenzeppelin.
Flugbahnwagen/ Schienenzeppelin/ Propeller Triebwagen von Franz Kruckenberg
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