RichL Posted August 11, 2020 Share Posted August 11, 2020 Now that my 21mm/12mm gauge test track is finished I really need to get some stock built. It is a kind of catch 22 situation though. Whilst I pore over countless books getting a hold on the exact nature of my new layout, I have no precise idea of what stock I shall need. Some stock needs building though, if only to build up experience and fill in time before the layout is ready to be built. Firstly, there are a few Dundas Models Irish NG wagons on the go. I needed to get these running to test the test track. I hit a problem with excessive side play on the wheelsets though. Either the axles are shorter, or the bearings are different to those that the chassis were designed for. I have paused on these whilst I work on a solution. I guess that squeezing the bearings in a little should work. I also have a couple of ideas for quick and easy motive power. More about this another time. For 21mm gauge, I have a few wagon kits to put together and an out-of-period diesel to convert to the correct gauge. I am really itching to do a steam loco though. Whilst browsing through my ever growing collection of books, I came across a drawing and photo of a tiny loco for the Newry, Warrenpoint and Rostrevor Railway on page 67 of Locomotives of the GNRI. At around 3" long, it is really tiny in 4mm scale. It is so weird that I really fancy a model. Crazy, but true. So, I have decided to evaluate it to see if I really can model her. It was too hot to do anything energetic this afternoon so I decided to take a deep look at the design. The photograph in the book is very poor ( it was taken in 1885 or thereabouts, so fair enough). The drawing was probably made from the photo. Comparing the two, it seems to me that the drawing is not quite right. Perspective problems on steam locos make accurate scaling from a photo a real challenge, even when you know key dimensions. I scanned the images and started playing around in Photoshop. Firstly, here is the image in the book enhanced a bit to bring out more detail. This shows a few details not in the drawing, like the name of the loco seems to be on a small rectangular projection from the side of the loco, for example. The brakes appear to be only on one side of the loco. The rear bunker appears to be very rounded with pointy ends on the rear buffer beam. Using perspective and scale corrections I then stretched the photo to get a reasonably accurate idea of the proportions of the loco Because the loco photo is taken at around 45 degrees and from near ground level it is impossible to get a true side and end elevation from the photo directly. You can work out the relative proportions though by doing several different perspective corrections independently. The main conclusion so far is that the front end has been drawn too short. Here is the original with a very rough correction below just to give you the idea. . Whether I pluck up the courage to build it or not is a matter for another day, but I am finding the loco thoroughly addictive to study. My next step is to work out more of the relative dimensions more accurately and then maybe build a mock up in card to compare with the photo. The only useful dimension quoted in the book is the driving wheel diameter at 4ft. It was built by Grendon in 1850. Not likely to be any more information to go on. Even the frame details in the drawing are probably conjectural, I guess, as you can't make much out in the photo. Looking at contemporary designs may give me a few pointers to fill in the gaps. By coincidence I already have wheels suitable for her. I would be happy just to see it move under its own propulsion. Being able to haul something would be a bonus. 7 1 1 Quote Link to comment Share on other sites More sharing options...
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.