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Re: [CBQ] Re: Passenger geeps on dinkies

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Subject: Re: [CBQ] Re: Passenger geeps on dinkies
From: "Charlie Vlk cvlk@comcast.net [CBQ]" <CBQ@yahoogroups.com>
Date: Mon, 10 Jul 2017 10:10:11 -0500
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All-
Seems to me there was (either at that discussion or another one with the same players)  that brought up a control wiring modification that the Q used to juice up the acceleration on E8 and E9 units that couldn't be applied to E7 or E5 locomotives.  EMD was opposed to it but it worked fine for the Q.
While on the subject how about the rumored FM Trainmasters for suburban service?   Apparently it went far enough for FM to do a rendering of one in dinky service  crossing the DesPlaines at Riverside.   FM didn't have a chance (even though a H10-44 got an AFE to cover fuel for demo use at Western Avenue) because somebody left the Mechanical Department for a job at FM and it caused bad blood with Beloit. 
Charlie Vlk


Sent from my iPhone

On Jul 9, 2017, at 6:28 PM, jamessandrin@yahoo.com [CBQ] <CBQ@yahoogroups.com> wrote:

 

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 transition 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






























according to Grant



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Posted by: Charlie Vlk <cvlk@comcast.net>



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