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July 10, 2017
Jim - Fascinating material. I was aware that the E5 and E7 motors were
generally unsuitable for stop-and-go dinky service as they would not "load" fast
enough to stay on schedule, but I had never heard that EMD tried to
convince the Q to dieselize their suburban service with GP7s. All very
interesting. Perhaps, a basis for an article in the BRHS Bulletin.
Besides the west bound Sunday afternoon or evening dinkies with
multiple E8s to balance power at Aurora for the next morning's "parade,"
occasionally day time dinkies included an extra unit needed at either
Aurora or 14th Street to balance the power assignment sheet. In this
inserted/attached faded image, we find a mid-afternoon one car dinky
powered by the 9944B with an unidentified sister trailing. The
location or date is not given, but I'm sure someone in this Group
will recognize what stop it was:
Lots of wonderful memories for many of us from riding the dinkies in
Suburban Territory. Best Regards - Louis
Louis Zadnichek II
Fairhope, AL
In a message dated 7/9/2017 6:28:35 P.M. Central Daylight Time,
CBQ@yahoogroups.com writes:
In addition to Dennis'
thorough answer, here are some thoughts from BRHS meet history, courtesy of
Grant Aerosmith and Bob Landregen at a lunch where I was the privileged
fly-on-the-wall listener. According to Grant, EMD tried to sell the Q on
the idea that a GP7 would be able to replace the S1 and S2 Pacifics based on
horsepower. As Grant, working for Henry Urhbach in the Mechanical
Department at that time, pointed out to EMD boss Kettering and his engineers,
Dynamometer car readings showed that when accelerating away from a
station stop, a banked fire with a rapid introduction of forced air created a
short-term output of over 2100 horse-power from one of those S-class engines.
(Essentially a controlled boiler explosion) . This allowed acceleration that a
GP7 could never achieve. It was also performance that the E5 and E7 units on the roster could not
achieve as their control systems could not transiti on quickly enough from a
station stop to maintain a Dinky's schedule. This operating requirement
kept the Pacifics employed until the delivery of the E8 units which addressed the short comings of the
earlier units with increased horsepower and a much improved electrical
system.
Thought you might enjoy that. Jim Sandrin
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