Full Version: Diesel Hydraulics
Hi I was wondering will there be anymore Hydraulic locos like the Hood Unit or the Alco unit?
Not at this moment.
QUOTE(trainman @ Nov 12 2005, 10:52 PM)
Hi I was wondering will there be anymore Hydraulic locos like the Hood Unit or the Alco unit?
Hi trainman,
Do you mean Alco DH643 "Alcohaulics" ? I saw some photos of them, but dont know too much about them.
Yes I am looking for the Alco diesel hydraulic along with this unit. http://www.northeast.railfan.net/images/sp9006.jpg
That photo is of a Krauss-Maffei. Sacramento Locomotive Works made that before!!!!!!!! 
FYI there was two types of diesel hydraulic built by Krauss-Maffei.
I think i prefer the standard cab Krauss-Maffei units more than the cowl body ones...just something about...looks attractive.
Looking at the .eng files for the K-Ms, I see that there is a dynamic braking section, but no controller section for the dynamics. If they did have dynamics, would that be the standard 10-position switch?
QUOTE(BLW_1946 @ Jan 28 2007, 12:40 PM) 
Looking at the .eng files for the K-Ms, I see that there is a dynamic braking section, but no controller section for the dynamics. If they did have dynamics, would that be the standard 10-position switch?
If you think about it, it's kinda hard to have dynamic brakes when you have a hydraulic transmission not an electrical one... I guess The best you could hope for would probably be Engine Braking like downshifting your car....
QUOTE(BLW_1946 @ Jan 28 2007, 2:40 PM)
Looking at the .eng files for the K-Ms, I see that there is a dynamic braking section, but no controller section for the dynamics. If they did have dynamics, would that be the standard 10-position switch?
No dynamic brakes Tim as Chuck stated since the power was hydraulic. I remember once reading an article in Trains from way back that stated there was not much coasting on the locomotive either. I would imagine the back pressure from the hydraulics would give you a retrictive force, hence slowing the unit down
Thanks for the education. I just noticed the discrepancy in the .eng file when I was checking out a new cabview that was posted recently on t-s. I recall seeing pictures in Trains or Railfan years ago, but never really gave much thought to the specifics. They do have some interesting sounds...
QUOTE(Chucksc @ Jan 28 2007, 11:58 PM)
If you think about it, it's kinda hard to have dynamic brakes when you have a hydraulic transmission not an electrical one... I guess The best you could hope for would probably be Engine Braking like downshifting your car....
QUOTE(milepost56 @ Jan 29 2007, 12:36 AM)
No dynamic brakes Tim as Chuck stated since the power was hydraulic. I remember once reading an article in Trains from way back that stated there was not much coasting on the locomotive either. I would imagine the back pressure from the hydraulics would give you a retrictive force, hence slowing the unit down
I am not too familar with the Krauss-Maffei dieselhydraulics, but AFAIK they are a derivative of the German V200 class.
The V200 class had no dynamic brakes, "only" a pneumatic brake. As you pointed out, the concept of dynamic braking as you understand it does not exist with dieselhydraulic traction.
However there is the so-called "operative brake" (German: "Betriebsbremse"), which as per German operating rules is the default brake to use. It uses hydrodynamic braking and in its result works just like dynamic braking, just on a fluid-based level.The Class 218 diesels, which are Germany's most powerful current diesels, are equipped with such a hydrodynamic brake.
http://www.youtube.com/watch?v=aCSwQcCTCxA
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