Re: "Trimming" Both Engines of a Mallet

NW Mailing List nw-mailing-list at
Sat Jul 23 14:07:54 EDT 2022

Abe,Drawings are in the archive. As far as the linkage is concerned it is pretty simple. Just follow the arms and levers.. An arm from reverser is connected to the HP valve gear, which in turn has a crossbar which has a lever in the middle, which has an arm going forward to a lever on a crossbar of the LP valve gear.Jimmy LisleSent from my Verizon, Samsung Galaxy smartphone
-------- Original message --------From: NW Mailing List <nw-mailing-list at> Date: 7/23/22  1:21 PM  (GMT-05:00) To: N&W Mailing List <nw-mailing-list at> Subject: Re: "Trimming" Both Engines of a Mallet 
   After two cups of morning coffee, I think I figured out part of the answer.
   1.  On Compound engines, the once-expanded steam at full pressure and volume was probably sent forward to the front engine, so the front engine did not need trimming.  But it still needed reversing, and I have not figured that one out, yet.
   2.  On Non-Compound engines, like the Class A articulateds, my original question still stands.  How was steam admission to the front cylinders reversed and how was it trimmed, from the single reverse bar in the cab?
   So many questions.  Life is complex.... or is it Compound ?
   -- abram burnett
    Macro-Trends Turnip Consultancy 

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