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Re: What does the freight/commute switch do on an SDP-45
Author: OPRRMS
Date: 07-31-2013 - 11:20

Dr Zarkoff Wrote:
-------------------------------------------------------
> This was an SP modification. When put in the
> "Commute" position, the switch put the switch gear
> into parallel so you started out in parallel and
> never had forward or backwards transition during
> acceleration and deceleration. In "Frt" you had
> forwards and backwards transition. After this
> modification, the engines were known as
> troublemakers because of not loading sometimes
> after making backwards transition, particularly
> the 3208. The "fix" was to zip the throttle to
> idle and then back out to what ever position you
> were in.

Absolutely correct. It became a problem when they were used in freight service with engineers who weren't familiar with this issue and didn't know how to overcome it. Same issue that came up after Amtrak started running the ex-UP E8's, which didn't have automatic backwards transition.

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Subject Written By Date/Time (PST)
  What does the freight/commute switch do on an SDP-45 HUTCH 7.62 07-30-2013 - 21:32
  Re: What does the freight/commute switch do on an SDP-45 Wes Swift 07-30-2013 - 21:39
  Re: What does the freight/commute switch do on an SDP-45 Chris Walker 07-30-2013 - 22:54
  Re: What does the freight/commute switch do on an SDP-45 P. Kepler 07-30-2013 - 23:11
  Re: What does the freight/commute switch do on an SDP-45 RWS 07-30-2013 - 23:48
  Re: What does the freight/commute switch do on an SDP-45 Erik H. 07-31-2013 - 07:11
  Re: What does the freight/commute switch do on an SDP-45 P. Kepler 07-31-2013 - 08:56
  Re: What does the freight/commute switch do on an SDP-45 Dr Zarkoff 07-31-2013 - 10:04
  Re: What does the freight/commute switch do on an SDP-45 OPRRMS 07-31-2013 - 11:20
  Re: What does the freight/commute switch do on an SDP-45 HUTCH 7.62 07-31-2013 - 17:23
  infamous SDP-45 HUTCH 7.62 07-31-2013 - 18:04
  Re: infamous SDP-45 Tom Moungovan 07-31-2013 - 19:13
  Re: infamous SDP-45 Margaret (SP) fan 07-31-2013 - 21:49
  Re: infamous SDP-45 HUTCH 7.62 08-02-2013 - 22:33
  Re: infamous SDP-45 Fred 08-03-2013 - 12:58
  Re: infamous SDP-45 HUTCH 7.62 08-05-2013 - 19:25
  Re: What does the freight/commute switch do on an SDP-45 OPRRMS 07-31-2013 - 19:08
  Re: What does the freight/commute switch do on an SDP-45 Dr Zarkoff 07-31-2013 - 20:39
  Locomotive electrical systems HUTCH 7.62 07-31-2013 - 21:41
  Re: Locomotive electrical systems SP5103 08-01-2013 - 09:30
  Re: Locomotive electrical systems ex-BN 08-01-2013 - 10:40
  Re: Locomotive electrical systems Dr Zarkoff 08-01-2013 - 10:44
  Re: Locomotive electrical systems SP5103 08-01-2013 - 13:46
  Re: Locomotive electrical systems is transition in the MG or the TM 07-24-2015 - 06:16
  Re: Locomotive electrical systems Dr Zarkoff 08-01-2013 - 09:59
  Re: Locomotive electrical systems mook 08-01-2013 - 18:06
  Re: Locomotive electrical systems HUTCH 7.62 08-01-2013 - 19:27
  Re: Locomotive electrical systems Dr Zarkoff 08-01-2013 - 19:43
  Re: Locomotive electrical systems HUTCH 7.62 08-02-2013 - 18:47
  Re: Locomotive electrical systems SP5103 08-01-2013 - 20:31
  Re: Locomotive electrical systems Dr Zarkoff 08-01-2013 - 21:24
  SDP-45 porn HUTCH 7.62 08-02-2013 - 22:36
  Re: SDP-45 porn WAF 08-03-2013 - 12:07
  Re: Locomotive electrical systems SP5103 08-03-2013 - 13:04
  Re: Locomotive electrical systems Dr Zarkoff 08-04-2013 - 11:32
  Re: Locomotive electrical systems Dr Zarkoff 08-05-2013 - 19:31
  Re: What does the freight/commute switch do on an SDP-45 RR Gary 08-03-2013 - 15:34
  Re: What does the freight/commute switch do on an SDP-45 OPRRMS 08-03-2013 - 17:24


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