Slugs with motors
Author: Ernest H. Robl
Date: 12-05-2017 - 09:56

In a way, Gensets are slugs with motors. Under a light load, the extra diesel generator sets are basically ballast weight.


But, for a more direct example:

A number of years ago, I wrote an analytical article that offered a solution for a transition period if/when freight railroads ever decided to electrify. Though an acquaintance, who is a (now retired) professor of electrical engineering (with some interest in railroads), said the proposal made perfect sense, I could never get any magazine interested in publishing it.

Basically, this is the idea: You set up 3-piece motive power sets consisting of a six-axle diesel (using existing diesels), a new electric locomotive, and another six-axle diesel (again using an existing diesel).

These sets would allow heavy freight trains to run on both electrified and non-electrified lines.

What happens is that, on non-electrified lines, the electric locomotive acts as a slug, with its two trucks being powered by the adjacent diesels. On electrified lines, the diesels are shut down, and act as slugs, receiving their power from the electric locomotive.

Yes, the diesels would need some modifications, including controls to switch between modes, and some heavy-duty cables to carry power. But the whole set would be a lot cheaper than buying three new electric locomotives -- and having to change motive power at the ends of electric territories, particularly in the beginning when only a small amount of territory was electrified.

The modifications on the diesels would also include block heaters to keep the prime movers from freezing when shut down -- and making them easier to start.

I would, of course, begin by electrifying major tunnels, thereby greatly increasing their capacity -- with not having to wait for diesel exhaust to be vented.

Yes, this is a simplified version. In the paper, I addressed a number of other issues, including the fact that the transformer on the electric locomotive would need to have a higher rating than if the electric were only expected to operate on its own.


But, I hope you see that the general idea would work.

-- Ernest



Subject Written By Date/Time (PST)
  Slug Question Don B 12-04-2017 - 13:54
  Re: Slug Question E9A 12-04-2017 - 15:40
  Re: Slug Question BOB2 12-04-2017 - 16:00
  Re: Slug Question OPRRMS 12-04-2017 - 17:00
  Re: Slug Question BN Oly 12-04-2017 - 18:36
  Re: Slug Question OPRRMS 12-04-2017 - 20:27
  Re: Slug Question OPRRMS 12-04-2017 - 20:34
  Re: Slug Question sklinck1 12-04-2017 - 20:02
  Re: Slug Question HUTCH 7.62 12-05-2017 - 07:08
  Re: Slug Question Ed Workman 12-05-2017 - 08:22
  Slugs with motors Ernest H. Robl 12-05-2017 - 09:56
  Re: Slugs with motors Jasper 12-05-2017 - 11:17
  Re: Slugs with motors to electrics and diesels BOB2 12-05-2017 - 12:02
  Re: Slugs with motors to electrics and diesels OPRRMS 12-05-2017 - 12:20
  Re: Slugs with motors to electrics and diesels Ed Workman 12-05-2017 - 12:46
  Re: Slugs with motors to electrics and diesels Ed Workman 12-05-2017 - 12:40
  Re: Slugs with motors to electrics and diesels Max Wyss 12-06-2017 - 03:29
  Re: Slugs with motors Max Wyss 12-06-2017 - 02:53
  Re: Slug Question OPRRMS 12-05-2017 - 12:07
  Re: Slug Question - Question Espee99 12-05-2017 - 12:36
  Re: Slug Question - Question Max Wyss 12-06-2017 - 03:32
  Re: Slug Question Ed Workman 12-05-2017 - 12:41
  Re: Slug Question E9A 12-05-2017 - 13:28
  Re: Slug Question BillB 12-05-2017 - 16:44
  CGW cow and calf Chico 12-05-2017 - 17:20
  Re: CGW cow and calf OPRRMS 12-05-2017 - 18:06
  Re: CGW cow and calf HotWater 12-05-2017 - 18:18
  Re: CGW cow and calf- SP TR-6 Cow and calfs, and TEBU:'s BOB2 12-05-2017 - 19:10
  Re: CGW cow and calf- SP TR-6 Cow and calfs, and TEBU:'s OPRRMS 12-05-2017 - 19:51
  Re: CGW cow and calf- SP TR-6 Cow and calfs, and TEBU:'s OPRRMS 12-05-2017 - 19:54
  Re: CGW cow and calf- SP TR-6 Cow and calfs, and TEBU:'s OPRRMS 12-05-2017 - 19:59
  Re: CGW cow and calf- SP TR-6 Cow and calfs, and TEBU:'s Craig Tambo 12-05-2017 - 19:59
  Re: CGW cow and calf- SP TR-6 Cow and calfs, and TEBU:'s OPRRMS 12-05-2017 - 20:06
  Re: CGW cow and calf- SP TR-6 Cow and calfs, and TEBU:'s Dr Zarkoff 12-05-2017 - 20:44
  Re: CGW cow and calf- SP TR-6 Cow and calfs, and TEBU:'s OPRRMS 12-05-2017 - 21:19
  Re: CGW cow and calf- SP TR-6 Cow and calfs, and TEBU:'s SLUGS in PDX 12-06-2017 - 16:47
  Re: CGW cow and calf- SP TR-6 Cow and calfs, and TEBU:'s George Andrews 12-06-2017 - 17:11


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