The MEC GP38s were originally delivered with Leslie S3L horns. They didn't get Nathan K5LAs until later, starting in the late '70s.
The horn currently installed on the 252 is a Leslie RS2M (most commonly found on switchers and subway cars), and I do hope they replace it with at least a 3-chime if not a 5-chime. An RS5T would sound AMAZING up there in the mountains.
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