BigJim Nothing on this thread has anything to do with RPM differences between two types of locomotives.
Nothing on this thread has anything to do with RPM differences between two types of locomotives.
Yes You are correct. It's about the control system loading rate. The OP just didn't have the right vocabulary to explain it that way, I think.
-Don (Random stuff, mostly about trains - what else? http://blerfblog.blogspot.com/)
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That's exactly the real life situation that caused me to to initiate this topic. Thanks for confirming what I had otherwise just suspected.
There's a lot here.
"constant nudging of the EMD,"? Does this mean the EMD was repeatedly loading to an illogical wheel-slip-causing wheel-spin? While the GE settled into a slog load, drag, constant drag?
Pity from me to you southern "engineers", excluding those that don't react to a stall on a mound, a dinky slope, a bit of a hill, engineers who say, the train: "she layed down" on me.
"She layed down on me" Stalling on a hill.
I'm a Sierra-Tehachapi-Cuesta-Beuaumont-SD%AE qualified engineer, also Altamont, SP's Cajon Pass....You know why a train stalls.
The train didn't "lay down on me."
The big brush I painted of the east Texas TNO engrs were there in the larger era of the '70's and maybe,later years, surely, they have evolved.
The power/torque band for the EMD design engines seems lower than GE uses, so there would have to be a slight difference, even if both had same gearing, that said a 645/16 needs to keep the 900 rpm for its 17,510 ftlb of tporque. What you said, about what was told you makes sense to me..
... was told decades ago by an Engineer on the Southern, that he had rather an EMD in lead for smoother run; otherwise if GE in lead, he could 'feel' the constant 'nudging' of the EMD as trailing unit, which was responding (loading) quicker/faster - whatever RPM's in/or .. whatever notch - however, when entering a steeper grade, the EMD would start dropping off quicker than the GE; and dropping off slower, would start 'digging in' for the long haul ...
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