Classic Trains - Frisco 4300's

Discussion in '4300 Class Mountains' started by meteor910, Nov 3, 2010.

  1. TAG1014

    TAG1014 Supporter Supporter

    In some of the Frisco books (Collias' Frisco Power for one), sometimes the engine horsepower is mentioned. 4300's, 4400's, 1500's, 1060's to name some. Is there any correlation between horsepower and tractive effort?

    Tom G.
  2. Karl

    Karl 2008 Engineer of the Year Supporter

    On the attachment, I have included Cole's Formula for TE and the PLAN Formula for HP. You will note that they share certain variables, but ultimately we might say that HP is the rate at which TE is applied. In some cases, there is a good correlation between TE and HP such as with the 4300. On the other hand the Mallets, which could produce a TE of 100,000 lbs when starting as a simple machine could not approach the HP of a 4300.

    When speaking of steam locomotives and HP, one must always include the speed at which that HP is produced. Unfortunately, Stagner did not give this in his book.

    The attachment includes a qualitative graph, which plots TE and HP against speed for a given steam locomotive.

    I love this text.

    Attached Files:

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