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Re: Tractive effort vs horsepower - again

Earl
March 28, 2001 08:50AM
I think we went through this before. didn't we?
Tractive Effort and Horsepower are different animals. Tractive Effort is the ability to start a train from rest. Horsepower is the ability to take that same train and run at speed with it. A steam locomotive, because it has a direct connection between the cylinder and drive wheels, makes more horsepower the faster it runs. The limitation is the boiler's ability to make steam.
A K36 climbing Cumbres as 11 mph with 235 tons on its tank is about at its maximum horsepower. The boiler is taxed close to its limit. But it also at its limit at 15 mph with 200 tons on its drawbar. It still sucks coal and water as fast as you can feed it and just won't go any faster without losing steam or water.
Diesel Electrics, because of the generator/traction motor drive, can put their full horsepower down at very low speeds, as long as traction can be maintained. In theory, a diesel can put down its maximum horsepower at 1 mph. Of course, you will over load the generator, traction motors, etc. As Speed comes up, the horsepower output drops on a diesel. Many modern steam locomotives, could run a way and hide from a diesel of the same horsepower rating, because when the diesel was starting to run out of horsepower at 25 mph, the steam locomotive was just coming to life.
This is why a steam locomotive will pull a train it can't start and a diesel will start a train it can't pull any distance without damage.
To answer the above, according the 1930 Locomotive Cyclopedia, a K36 makes 1406 cylinder horsepower.
Subject Author Posted

Locomotive Ratings

Frank Martindell March 27, 2001 10:44AM

Re: Locomotive Ratings

Earl Knoob March 27, 2001 02:13PM

Re: Locomotive Ratings

Scott Hightower March 27, 2001 02:49PM

Tonnage

Mike Trent March 27, 2001 05:24PM

Re: Tonnage

Earl March 28, 2001 08:25AM

another thing...

Earl March 28, 2001 09:03AM

Re: another thing...

Gary Nichols March 28, 2001 11:53AM

Gary, your answer is in....

Rick Steele March 28, 2001 04:03PM

Re: Gary, your answer is in....

Gary Nichols March 28, 2001 05:49PM

Re: Gary, your answer is in....

AC Woodward March 29, 2001 11:23AM

Re: Gary, your answer is in....

Earl March 29, 2001 01:05PM

C&S Motive Power

Mike Trent March 31, 2001 06:31AM

Re:MAN Power

Mik April 01, 2001 12:03PM

OK, what are maintenance costs?

Doug vV March 29, 2001 07:06PM

Re: Tonnage

AC Woodward March 29, 2001 11:14AM

Re: Tonnage

Earl March 29, 2001 12:54PM

Crude weight

Don Richter March 29, 2001 03:54PM

Re: Locomotive Ratings

Don Sharer March 27, 2001 09:14PM

Re: Locomotive Ratings

Fred T March 27, 2001 10:47PM

Re: Tractive effort vs horsepower - again

Earl March 28, 2001 08:50AM

Re: Tractive effort vs horsepower - again

Tom Shreve March 28, 2001 09:09AM

Or

RBrinton March 28, 2001 12:23PM

Re: Or

J.B.Bane (SVRy) March 29, 2001 08:24PM

3 most common dumb questions

Earl Knoob March 30, 2001 12:44PM

Or “Where is the key to start it? *NM*

RBrinton March 30, 2001 01:49PM

And they let them have children? *NM*

Herb Kelsey March 30, 2001 05:20PM

Re: 3 most common dumb questions

Doug vV March 30, 2001 06:24PM

Re: 3 most common dumb questions

Tom Shreve March 30, 2001 10:56PM

Re: 3 most common dumb questions

The Conductor March 30, 2001 11:57PM

Re: 3 most common dumb questions

Earl March 31, 2001 07:18AM

3 more - from dumb tourons

Steve Peck April 03, 2001 02:58PM

Re: 3 more - from dumb tourons

Allen Tacy April 03, 2001 05:45PM

People!!

RBrinton April 04, 2001 02:23PM

Re: People!!

Chile John April 05, 2001 09:23AM

Eastern Tourists

RonRit April 05, 2001 09:41AM

Re: Eastern Tourists

G. W. Laepple April 06, 2001 12:57PM

One I heard

David Dewey April 10, 2001 12:15AM

Re: One I heard

Glenn Christensen April 10, 2001 08:48AM

Re: One I heard

Dave Peterson April 10, 2001 01:26PM

Re: One I heard

Rick Steele April 11, 2001 02:54PM

Re: 3 more - from dumb tourons

Rick Steele April 07, 2001 09:12AM

Re: 3 more - from dumb tourons

Mike Ramsey April 07, 2001 12:58PM

Re: 3 more - from dumb tourons

Steve Peck April 07, 2001 01:51PM

Re: 3 more - from dumb tourons

Boris Serena April 08, 2001 09:19PM

Re: 3 more - from dumb tourons

Rob Gram April 09, 2001 07:05AM

Re: 3 more - from dumb tourons

Phil Johnson April 09, 2001 09:42AM

Re: 3 more - from dumb tourons

Mik April 09, 2001 10:48AM

Re: 3 more - from dumb tourons

Steve Peck April 09, 2001 11:30AM

You're right, of course

Mik April 09, 2001 08:49PM

Good idea!

dan April 11, 2001 11:04AM

Re: Educating the "tourons"

Mik April 11, 2001 01:59PM

Re: 3 most common dumb questions

Mik March 31, 2001 12:18AM

Mud Ring Disaster

Taylor Rush April 05, 2001 08:41AM

It worked din't it?

Mik April 05, 2001 08:46AM

Re: Mud Ring Disaster

J.B.Bane (SVRy) April 05, 2001 06:47PM

Re: Mud Ring Disaster

Taylor Rush April 05, 2001 10:34PM

Re: Mud Ring Disaster

Chris Ahrens April 06, 2001 07:27PM

A smart-A response

Greg Scholl March 31, 2001 07:53AM

Re: A smart-A response

Michael Allen March 31, 2001 08:09PM

Re: Tractive effort vs horsepower - again

Jim Adams March 28, 2001 04:24PM



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