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You're mixing up your street switchers. The PRR had a large number of solid rubber tired tractors with the ship's helm you describe. The B&O used several small trolley motors over the years; MR had drawings of the last one several years ago. When the lacal streetcar line folded, B&O purchased a four wheel tractor to replace the trolley; it was unlike the PRR machines which were used just a few blocks away. The last B&O trolley motor used and the tractor are both in the B&O Museum collection. I don't know their status after the infamous roof collapse, and I don't think the staff there has time to fool with inquiries about them at this time. A copy of Harwood's "The Impossible Challenge" will show you what the B&O stuff looked like; inquire at one of the PRR historical groups to see what their machines looked like.
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