Semi-believable coupler pocket

From a review of the 1906 Locomotive Builders Dictionary¹ it seems like the pilot, and also likely the tender couplers on 622 should not have draft gear per se, but would have been mounted in cast coupler pockets, without any springing at all.  These were very narrow affairs, barely wider than the 6-inch shank of the coupler itself.  So, if I am to use Accumate couplers on this engine, a little compromise is necessary.

None of the photos I have shows the coupler pocket in sufficient detail, and so, I found the Tower Pocket Coupler from National Malleable Castings Co (page 237) that seems to fit.  It serves as an inspiration more than prototype, as it needs a much wider opening to enable the Accumate coupler to slide in from the front.  Hopefully nobody notices the compromise.

¹Thanks again to Don Ball for pointing this resource out to me, and to the University of Wisconsin for keeping a copy, and to Google for digitizing it!


5 thoughts on “Semi-believable coupler pocket

  1. That’s a nice approach. I can’t recall your tightest curves – did you factor that into the design at all?

    1. Thanks Rob.

      The tightest curve – into the engine house – is 36 inches in radius. I didn’t factor that specifically into the design. There is still quite a bit of swing allowed by the opening at the front of the pocket – much more than the prototype – and so I should be okay.

      Thanks, Rob!


  2. Re CBDs

    Many of the early cbd/cbc/industry journal compilations are available from Vintage Literature Reproductions ( for $4-15. They’re an outfit out of Ontario that I’ve purchased twenty odd discs from without issue. Some of the compilations cover a number of years/decades. This makes them handy for cross checking and understanding how components evolved over time when you can’t find exactly what you’re after.


  3. If you have access to a tower I *believe* they are PDFs… so it would seem you could change modes for personal use if the discs are the only option. I haven’t checked yet for possible downloads


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