Aha... Looks like a revamped old car used to test engine & stress forces, though solar still mystery. Car Lighting? http://www.answers.com/Q/What_is_Union_pacific_mobile_lab …
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Perhaps solar keeps minimal lighting and temperature services going sans engines.
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4 panels <1kw solar peak vs 5000kw peak train power. Maybe keeps the starting batteries charged when stationary.
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