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They all look like forklift totes to me. Perhaps the taller one is for Nalco water treatment as it looks to be about the right height for adding treatment to the cooling system . Perhaps the other two are lube oil , compressor oil, governor oil or even water for filling batteries. They can be carried around where they are needed , they don't appear to be fixed in one spot. Maybe they load them onto a service truck for outlying locations where locomotives need service/ Randy
Look at the colors: they're clearly for Google Locomotive, duh! lol