4-6-0 with different drive wheels?

Discussion in '4-6-0 Ten Wheeler' started by tripphd, Aug 20, 2021.

  1. tripphd

    tripphd Member

    I found this picture of 4-6-0 448 on Mike Condren's website. The drivers look different to me, like they have wedge shaped balancers(?). I don't remember seeing anything like them. I thought the attribution would attach to the photo, but it didn't. It's a Jack Avery photo from the Louis A. Marre Collection.

    Attached Files:

    mountaincreekar likes this.
  2. klrwhizkid

    klrwhizkid Administrator Staff Member Administrator Frisco.org Supporter

    The triangular counterbalances were an early version of attempts to balance the forces involved in the reciprocating and rotational masses of the rods and drivers. As more was understood and machining and casting sophistication grew, the types and shapes of counterbalances evolved.
  3. Karl

    Karl 2008 Engineer of the Year Frisco.org Supporter

    I have read several period engineering articles, which admit that the physics of counter-balancing and cross counter-balancing locomotive drivers to be a poorly understood science.
  4. yardmaster

    yardmaster Administrator Staff Member Administrator Frisco.org Supporter

    I’d have to look a bit further to verify, but I think it’s on a Frisco 4-6-0 where the drivers’ counter-balancers are disc-shaped, creating a distinctive Mickey Mouse silhouette effect.

    Frustrations for the era-specific Motive Power folks aside, these details sure make modeling the prototype great fun.

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