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Because by the end of the 1960s much 'passenger'
service was hauling mail. A pair of E7s, 1 baggage car, 3 coaches and twelve
mail cars would not be unusual. The cab would be needed to for pick-up and
set-off moves for the mail cars.
Or so I would surmise.
Page 104 of Pennsy Diesel Years V. 3 shows
a NH cab that made it all the way to Columbus, Oh., as a "rider car on a mail
train".
Page 114 of the same book shows a Pennsylvania
Ltd. made up of "three Es, four baggage cars of mail and express, two coaches,
twelve more cars of mail and express, rider cabin car #4723 {four digit number},
and still another car of mail."
This was in 1970 (the caption says Amtrak was a
year away), so it was a PC train. I don't know if PRR pioneered this, or if PC
originated it. But there it is, documented and with photo evidence.
Patrick
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