I'll guess that the units had hostler controls on one side allowing a roundhouse worker to move them around at low speeds even when not coupled to a unit with a cab. It appears the window is different, suggesting it could be opened so the hostler could lean out the window to observe movement.
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by the looks of the window it seems to open in must have controls in that location to move the unit by it self ..just saying could be wrong
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The fifth porthole indicated that the booster was equipped with a hostler control.
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Thanks Gents, for the informative comments.
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Another section following....
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