Thanks for the explanation, Ben, and for the tip - I'm going to go scour
the archives now. Though just before checking my inbox and seeing your
message, I sent a new one in which at the end I concluded they were used
in general service, too.

Frank Valoczy
Vancouver, BC

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http://hydrorail.hostwq.net/index.html - Rails along the Fraser
http://hydrorail.rrpicturearchives.net/ - Rail Photos