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Greenly Reverser

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Paul Sherriff31/07/2021 18:02:10
11 forum posts

I wondered if someone could point me at the edition of the ME that contained drawings and build details of the Greenly reverser as used on the RH&DR locomotives

A clever device formed of a stew reverser with a pole that unclapsed the nut and allowed pole reversing, giving you the choice of either method of reversing

Thanks in anticipation



Nigel Graham 231/07/2021 21:47:37
2056 forum posts
28 photos

A suggestion if your enquiry draws a blank.

Essentially, design and make a half-nut held on a die-block working in a slot in the reversing-lever, to accomodate the vertical displacement due to the lever's arc. The nut would be operated from the trigger that would otherwise operate the quadrant catch; the thread itself giving the notches on a "quadrant" of infinite radius. (c.f. the toothed rack)

Provided the engagement is sufficiently positive, you should need only the upper half of the nut, otherwise you are looking at a clasp-nut worked by a cam or double-ended lever, similar to that on a lathe.

The thread would probably have to be of square form to remove any ramp-climbing tendency, and the lever preferably double-sided over the screw to support the die-block from both sides.

Have you tried contacting the RH&DR for information?


I believe there was an early 19C standard-gauge design for such a combined control, but which overcame the arc displacement problem by using a barrel-shaped screw. I think it was found too difficult to make economically; but I imagine it would have required either a thread-milling capacity very advanced for its time, or much simpler and much more likely, a centre-lathe fitted with a profile-follower.

I do not know how it handled the question of thread-flanks not radial to the reverser-lever fulcrum / screw-radius centre. A profiled thread perhaps; the half-nut or catch made to swing about its own centre, or the nut "thread" being horizontal pins like a segment of a lantern-gear.

Paul Sherriff31/07/2021 22:03:33
11 forum posts

Thanks. Very helpful and food for thought

duncan webster01/08/2021 14:32:56
3947 forum posts
63 photos

Have you tried asking the rhdr

Nigel Graham 201/08/2021 17:25:02
2056 forum posts
28 photos

I'd already suggested that, Duncan!

Paul Sherriff01/08/2021 20:30:48
11 forum posts

Message sent to the RH&DR

fingers crossed


Paul Sherriff26/01/2022 19:30:49
11 forum posts

Never did get a reply. Oh well….

John Baguley26/01/2022 19:47:44
504 forum posts
54 photos

The reverser is described with drawings in Volume 53, Issue 1281, Page 630.


Former Member26/01/2022 19:49:12
1085 forum posts

[This posting has been removed]

Paul Sherriff26/01/2022 19:54:55
11 forum posts

Thanks John , just what I was after

many thanks

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