I'd rescue MEC 407 (GE U18B), restore it to like-new condition inside and out, and either donate it to a museum/tourist road, or lease it to a shortline.
I'd give the Maine Narrow Gauge Railroad a ton of money so they could expand their line, fix up their facilities, rebuild/restore all of their equipment, etc.
I'd go to EMD, or GMDD, or whatever they're called today, and have them develop a new moderate-horsepower, four-axle roadswitcher. It would have an 8-cylinder turbocharged 710 engine, probably rated around 2000HP or thereabouts. It would basically be a modern, Tier II-compliant version of the GP15T. It would be comparable to a GP38-2 in terms of pulling ability, reliability, etc., but more environmentally friendly and more fuel efficient. There would also be a 3000HP version powered by a 12-cylinder turbo 710... comparable to a GP40-2 but, again, better fuel efficiency and whatnot.
MEC407
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Pan Am Railways — Boston & Maine/Maine Central — Delaware & Hudson
Central Maine & Quebec/Montreal, Maine & Atlantic/Bangor & Aroostook
Providence & Worcester — New England — GE Locomotives