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MikeOxon

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Everything posted by MikeOxon

  1. One of the things I really enjoy about 3D- printing is the ease with which I can make modifications. No messing about with razor saws, files, and the like, with all the resulting swarf. Just some simple drawing tools, in this case a simple rectangle on the floor, which can be copied and pasted to sit over the four wheels. I also added the brake hanger that I forgot the first time round. Just a few minutes with the computer and I have a new model to print
  2. Earlier wagons had 4' wheels with boxes over them where they protruded through the floor - which must have been very inconvenient at times. The wheels were changed later to 3'6" but clearance was still marginal so that plates were placed over apertures in the floor. I selected just the body and axle guards of the wagon in the last photo and moved the all down a little, using Photoshop. Later, I shall re-print the floor with apertures for the wheels. It's all part of the learning curve! The mention of the 12t load is in a contemporary reference and matches the tonnages reported for coal brought down to Bull Pill. Incidentally, there were no Break Vans but a guard rode on every 15th wagon, presumably to pin down the brakes on the rather steep incline down through the Haie tunnel. Mike
  3. Yes! I made the floor too thick - a problem apparently for the prototype too. The Prior drawing shows metal plates above the wheels, presumably covering cut-outs in the planking. I shall correct this in the next print. I was too impatient to post.
  4. Thank you for your appreciation, Douglas I'm feeling a lot more confident now, when using my FDM printer and find it is adequate for most 4mm models. Sometimes, I feel that the slightly rough finish reflects the actual qualities of prototypical 19th century constructions, built from wood and wrought iron.
  5. When I started to build my model of one the Broad Gauge ‘Bogie-class’ engines, it was purely on a whim, because I was attracted by their jolie-laide appearance. At that time, I thought they were South Devon engines, generally confined to the West Country. I had brought my model close to completion when some further research revealed that they were also familiar engines in the Bullo Pill area, which was exactly where I had started my Broad Gauge modelling! My model of ‘Bogie-class’ 4-4-0ST While reading Ian Pope and Paul Karau’s book “The Forest of Dean Branch, Voume One”, I found a list of locomotives shedded at Bullo Pill between 1854 and 1861. To my surprise, no fewer than 11 of the ‘Bogie-class’ engines were deployed there over that period! Two engines, with a third as a spare, were regularly allocated to handle traffic through the long Haie Hill tunnel and along the Forest of Dean Branch, which was used to bring minerals down from the various workings around Cinderford to the quay at Bullo Pill. My wife’s ancestors started working on the GWR at Bullo Pill in the 1860s. The family had lived near the line at Soudley from the early 1850s, so these engines must have been familiar sights for them. Thus, what began as a ‘whim’ turned out to be an integral part of train-working in the very area which had inspired me to start building broad gauge models! Now, I had to start looking for more information about the trains which used to work this Branch. I found that there had been an accident in 1863, when a train of 70 wagons broke free and led to a ‘pile up’, said to be 15 wagons high, which took 5 days to clear! After that, trains were limited to 45 trucks, although these were reported to be ‘12 tonners’. In 1869, about 1,500 tons passed down the branch daily. Coal was shipped from Bullo Pill , chiefly to Bridgewater and Dunball, while pig iron from Cinderford and Soudley Iron Works was shipped to Newport. Later, coal trains were assembled in the evening, to travel onward via Swindon to Salisbury, where much Forest of Dean coal was used. A later photo, from the end of the 19th century, shows a Midland Railway wagon (type D351 – identified for me by @Compound2632) tipping coal into a barge at Bullo Pill dock. The tipping apparatus looks similar to those used at other docks along the South Wales railway route. The Broad Gauge Society (BGS) Magazine ‘Broadsheet’ No.38 (1997) contains an article by Terry Powell about the wagon hoist at Cardiff Dock, with an isometric drawing of the apparatus. Wagon Hoist at Bullo Pill Dock c.1900 I couldn’t find anything about 12-ton coal wagons in the BGS Data Sheets, which are my usual source of information. Fortunately, however, I found an article in the BGS Magazine ‘Broadsheet’ No.9 (1983), which described such a wagon and included a sketch. These wagons had a hinged door at one end, for tipping, as well as side doors. In addition, there is a BGS kit, available in both 4mm and 7mm scales, for a wagon of this type but, as my readers will know, I always prefer to ‘roll my own’. I continued to search for more information and eventually found some dimensioned drawings in Alan Prior’s book ‘19th Century Railway Drawings’. Modelling the Body Following my now usual methods, I started by importing Alan Prior’s drawing as a ‘canvas’ into my ‘Fusion 360’ modelling software and sketched over the main features. I then extruded these sketches, to form the sides and ends of my planned model. I added detailing, such as plank lines, straps, rivets, hinges etc. to the sides and ends, making considerable use of the ‘Pattern on Path’ command to create multiple lines of rivets, as required. Designing the Body in ‘Fusion 360’ Whereas I often print my models in sections and then assemble the parts after printing, in this case I felt that, as the entire vehicle was relatively small and there were no features to create overhangs, such as carriage windows, it would be appropriate to print the whole body as a single print-job. I still drew out the parts separately and then used the Move and Combine commands, to assemble the complete wagon within ‘Fusion 360’, before passing the design to my 3D printer. The print time was only just over 1 hour and I was pleased to find that the rivet detail printed cleanly: My 3D-printed 12-ton Broad Gauge Wagon Body Modelling the Chassis After creating the body, I proceeded to the chassis. According to the ‘Broadsheet’ No.9 article referred to above “The main feature is a standard under-frame applied to many different types of wagon such as Van Trucks, Rail Trucks, Tilt Wagons and Box Wagons etc.”. This will encourage me to make other wagons that can make use of this common chassis! The side-frames were of outward facing 8" x 4½" angle iron and the end frames were of 6" x9" timber. The wheels were 3’ 6” diameter with 9 spokes. The buffers were Brown's Patent 10" type and the running gear included Normanville's Patent axle boxes with the springs behind the 'W' irons. Brake gear was operated by an end lever. I used exactly the same methods as for the body, tracing the main members over the Alan Prior drawing and then adding surface details as required. I extruded two side frames and then set these the correct distance apart by adding headstocks between them. Chassis Frames for Broad Gauge Wagon My 3D-Printed Wagon As I have become more confident in the capabilities of my printer, I have started to try extruding finer details, such as the ‘W’-irons and springs (behind). On the whole, these have printed surprisingly well, as shown in the following photograph, which presents them under rather closer scrutiny than is appropriate for a 4mm scale model! These models are just as they were taken off the printer, loosely laid together and in the natural colour of the PLA filament. - no paint applied yet. My 12-ton Broad Gauge Wagon on its Chassis The break gear and release lever for the end-door have still to be added, to complete this wagon. Then, I don’t expect that I shall make 44 more of them, to re-create a typical prototype train on the Forest of Dean line
  6. I find that they are useful when read together with the detailed description and references. Eddy brought together lots of information in one place. Mike
  7. I’ve found a few useful drawings in Alan Prior’s book of 19th Century railway drawings.
  8. It gets most frustrating, when so much is documented about engines, a lesser amount about carriages , and d**n all about wagons! I'm trying to find some information about early Broad Gauge wagons at the moment. Mike
  9. I think part of the appeal of that photo of No.1072 is the profusion of tool boxes and other 'gubbins'. I recognise the polished bell on the side of the bunker but what is the other polished circle on the side of the firebox? I've never seen a toolbox high on the side of the firebox befire, either. Then there are the various rods to the sandboxes - large at the front but is that a much smaller one between the drivers? Mike
  10. MikeOxon

    Secret crush

    As Mikkel wrote - lovely wagons and something I must start adding to my Broad Gauge collection. In terms of 'modernity', it is alarming to think for how long small loose-coupled wagons were trundling around British Railways.
  11. information is never wasted and you never know which little nugget will solve a problem for someone. I write quite a lot of the details simply for myself - I frequently have to remind myself how to do things by reading my own posts. On the other hand, I can also have a good laugh over my clumsy earlier attempts Little things, like how to recognise a superheated engine, are always useful, too. Mike
  12. I also bought a Hornby 2721 very many years ago, because it seemed such a vast upgrade from the very crude Hornby pannier that I had before. I eventually used the chassis from the old pannier under a Wills 1854 saddle tank kit and retired the 2721, along with other models from the time when i was dabbling in the 1930s (more or less). I now seem to have moved back into broad-gauge days, so I shall probably pass on my 2721 to my grandchildren but it's good to see how the model can be brought up to more 'modern' standards. Mike
  13. Interesting comment about thinning his paints. I tend to use a roughly 50:50 mix of IPA and water because I find it flows much better, with the alcohol improving the 'wetting' of the surface. I rarely use 'modelling' paints but tend to use artists pigments. I like to apply a wash to the surfaces first and then add small amounts of pigment and build up the depth of colour slowly to achieve the effect that I want.
  14. before packing up, it might be worth trying Thunderer and/or Hurricane 'light engine', to see if there's any possibility of achieving 60mph
  15. The illusion is due to the 'strouters', which are the pieces that support the vertical framing from the horizontal joists across the chassis. They are shown clearly in the following illustration, which is an extract from a contemporary engraving by J C Bourne:
  16. On the subject of Thunderer, there's an interesting comment in the diary of G H Gibbs "The Birth of the GWR": "12 MAY 1838 Hammond came for me to Salt Hill with Harrison’s engine [Thunderer] and I went backward and forward on it twice. ... Along the greatest part of the four miles the engine ran beautifully smooth and for some way we cleared sixty miles an hour." Really! - I wonder if it was pulling anything? Brunel seems to have been rather taken with T.E. Harrison, the designer of 'Thunderer'. In a letter to him, dated 5th March 1838,he wrote: "... let me call your attention to the appearance - we have a splendid engine of Stephenson's, it would be a beautiful ornament in the most elegant drawing room and we have another of Quaker-like simplicity carried even to shabbyness but very possibly as good as engine, but the difference in the care bestowed by the engine man, the favour in which it is held by others and even oneself, not to mention the public, is striking. A plain young lady however amiable is apt to be neglected. Now your engine is capable of being made very handsome, and it ought to be so." What an extraordinary comment on an engine that was covered in large cogwheels and the like. I wrote an article in the BGS magazine 'Broadsheet no.79', which includes a description of the valve gear of 'Thunderer'. You might find it useful in detailing your model. By all accounts, the engine was a complete failure and, although some might regard it as a brave attempt to meet Brunel's impossible specification, it was really 'sleight of hand' that enabled it to meet the stipulated weight limits for the 'engine', by removing the boiler to a separate vehicle! Somewhere in the 'Imaginary Locomotives' thread, I once suggested that if Harrison had placed power units at both ends, he might have anticipated a 'Beyer-Garratt' Mike
  17. on the GWR tenders the middle axle was forward! By 1866, they were burning coal, though.
  18. Several early GWR tenders had uneven axle spacing From 1866, Swindon-built tenders had iron-plate frames and most had 6' 2" + 6' 10" wheelbase.-
  19. As others have said already - beautiful modelling. I especially like the last photo of the stained paving stones in the yard and the two figures, looking a little sinister with that knobkerry over the shoulder! I believe that the use of lime-wash was discontinued, because of its adverse effect on cows' feet. Jonathan should be careful not to splash too much on himself!
  20. Sadly, the modern-day successors are busily removing them all
  21. Many thanks for the info. Once I knew what it was, I found a good photo and description at: https://www.warwickshirerailways.com/misc/misc_equip202.htm The extra height was required to house a vertical steam boiler and this powered a small steam engine that drove an air compressor. The boiler's chimney could be removed when not required. Multiple connections for pneumatic tools were available from the pipework..
  22. Any thoughts on the rather strange-looking covered van on the left of the photo?
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