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When is a locomotive not a locomotive? When it's a track geometry car. This looks to be a slug, but it doesn't have traction motors. What it does have is a double cab for extra space and lots of computer equipment. It's been weighted to duplicate the weight of a typical locomotive (the added weight makes up for the lack of a diesel engine, generator, fuel tank and traction motors). Running this over a section of track duplicates what an engine would do, and how it would track. They use a bunch of sensors to measure how the engine moves and how the track responds.
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