I read one time that in the early days of diesels, one engineer always reduced the throttle so the engines could make transition (E-7's with auto transition). The resulting sudden transition of all the units at once was enough to spill coffee and soup in the dining cars. Once the problem was identified, it was eliminated.
Auto transition units make smoother transition when the throttle is wide open, because the units will not make transition all at once. On CC&P's ex-ICG GP-10's, I could tell when trailing units were making transition by noting when the individual units were automatically throttling down, and if they were successful when I felt the locomotives subsequently powering back up boB Nicholson ____________________________________________________ --- In [email protected], Thomas Baker <bakert@...> wrote: > > Dave, > > Ah, the memories of those train rides make one want to recreate a small world > of those days in modeling S. The longest train I can recall riding was on the > PRR--already PC, I think--in the summer of 1968 from Chicago to Cincinnatti > and back. The train had already lost its Pullmans and was coach-only. I > recall three E units up front, all E-7s, none of them looking very spiffy. > > In both directions we had about 20 cars but what an assortment. At the rear, > two PRR remodeled P70 coaches. In front of the coaches a Duke's mixture of > X29 mail storage cars, PRR type mail storage cars, a foreign road box car or > two serving as mail storage cars. There must have been a mail sorting car, > but I cannot recall for sure now. On the return trip when we arrived at > Union Station, I recall walking past perhaps 20 or more cars up to the front > of the three-unit combo. > > The consist was a sight to remember! > > Tom Baker > ________________________________ > From: [email protected] [[email protected]] on behalf of David > Engle [rirocket@...] > Sent: Thursday, November 29, 2012 8:11 PM > To: [email protected] > Subject: Re: {S-Scale List} Re: LokSound select decoders > > > > I don't want to drift too far off subject, but. . > > In ~1964 I had the fortune of riding Santa Fe from KC to Chicago on the > overnight Chicagoan(?). We had A-B-B-B-A F-7s and about 20 cars. When we > came off the Mississippi River Bridge and cleared the curve from the bridge, > the entire train of lightweight cars, mostly Budds, suddenly lunged forward > enough as it picked up speed that I was pushed back in my seat, there was no > sign of slack running out. Later in the trip I asked what could have caused > this, and it was suggested that all 5 units had transitioned at the same > instant. Also, remember that F-2s and FT-s had "manual" transition, and even > to their demise, it was cautioned on RI to have them lead newer > automatic-transition units, as they could get burned out if they were > trailing. Replicating that in the model venue could be a real trick. > > Dave Engle > KCMO > > ----- Original Message ----- > From: Greg<mailto:gelems@...> > To: [email protected]<mailto:[email protected]> > Sent: Thursday, November 29, 2012 4:26 PM > Subject: {S-Scale List} Re: LokSound select decoders > > > > The speed is what controls whether or not the engine goes through transition. > Usually they are set at about 24-26 mph for the engine to transition. The > reason they are set in that range is so a consist doesn't transition all at > the same time. Bad for the engines and bad for the train if you're on a grade > and all transition at the same time. :*( > > Greg Elems > > --- In [email protected]<mailto:S-Scale%40yahoogroups.com>, > "railroadpaul" <railroadpaul@> wrote: > > > > > > I dont know, I was watching some video of a GP-9 sorting cars and you can > > here the engine throttle up all the way with no transition and as soon as > > the crew got her moving the engineer would throttle down to iddle "with no > > transition" and coast through the switch, and they were working that engine > > hard... > > paul welsheimer > > > > > > --- In [email protected]<mailto:S-Scale%40yahoogroups.com>, "Brian > > Jackson" <brian__jackson@> wrote: > > > > > > When the 567 sounds like it's shifting down to notch 1 or 2, isn't that > > > called "making transition"? > > > > > > ------------------------------------ Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/S-Scale/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/S-Scale/join (Yahoo! ID required) <*> To change settings via email: [email protected] [email protected] <*> To unsubscribe from this group, send an email to: [email protected] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
