It's a Bonds Royal Scot designed for Bonds by Henry Greenly in the late 20's or early 30's, Drawings are available from Kennions , I know as I had a set delivered yesterday! ( I just bought a collection of 70 year old unmachined castings, the quality of which puts some of our suppliers to shame). It was designed as a 2 cylinder as opposed to the 3 of the full size, have driven an example many times and it steamed and ran well. One of the design options was greenly's double ported piston valves, these are on the drawings as well as the conventional piston valve cylinders. The design features a large roscoe displacement lubricator between the cylinders, where the third cylinder would be on full size, yours appears to have this.A dated design but there are a few finished ones I've seen running over the years. Googling Bonds Royal scot should provide some interesting answers, good luck with it. One of these has been top of my list for many years so I was delighted to chance over the castings.

A look at Station Road Steam's archive shows a couple of examples, including a part finished one

I've just noticed you have duplicates of some of the castings I don't have, if you decide to sell them in the future please let me know……..

Dave

Edited By Dave Wootton on 26/07/2023 17:51:19

Edited By Dave Wootton on 26/07/2023 18:08:42

Edited By Dave Wootton on 26/07/2023 18:09:39

Hi Martin, you may like to look at these two scans.

Regards Nick.

Nicholas, thank you for posting the scans, very interesting, unusual to see the valve events specified in the advertisement, most designs you have to work it all out for yourself!

Martin, I'm miles away in Folkestone right on the Kent coast, we can see France from our kitchen window! but my daughter lives near Lincoln so we do venture north. If I can help in any way please get in touch via PM not an expert on these by any means but long admired them, one of the first loco's I ever drove and always wanted to build one. I've got most of the important castings except cylinders so failing building a time machine and getting them for 7 shillings (35pence) each, it's either machine from solid or fabricate them, the castings and the drawings arrived only yesterday so not had time for a really good look at them.

As I said you are welcome to PM me if I can help in any way.

Dave

Edited By Dave Wootton on 26/07/2023 23:11:16

Hi Martin, as Vic has pointed out, it wasn't in ME, but Martin Evens did a 5" gauge Royal Engineer in Volumes 140 & 141, which is a Royal Scot class. There are drawings for this, but as Vic has said, the measurements would have to be modified to suite your model, and a few details maybe slightly different.

Regards Nick.

In the context of the boiler and the era (1939) of the design, if of steel construction then it may well have been gas welded or brazed. The fire tubes look neatly fitted, be it braze or weld. Now would be the time to decide when or if you would run it, and then in public or private. If in public then join a club and speak to the boiler inspector, for private use then you could conduct your own tests if you have the knowledge and equipment, though a club test is best ! Good Luck. Noel.