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Hello Lego train fans, (I repost here the work I have done on a pneumatic locomotive. I really don't know where to post since my MOC belongs to Technic category and Train category. So I post it here too. Of course here maybe we can talk more about the design and reproduction of the details of the locomotive. If this other post is too much, I am sorry that I posted in two places (and moderators could remove it), but I think it's understandable why I did this. Anyways !) I am glad to introduce you my last big project : a pneumatic steam locomotive ! I think it's one of the firsts pneumatic locomotives, using only Lego parts. I love trains as much as you do on this forum probably, so I hope some steam lovers will enjoy the model ;) The model is based on a Mikado type locomotive, from the mid 20th century. It especially copy the design of 141R french locomotives (even they were apparently built in USA, for France). First of all, the YouTube video and some photos: The idea with this model is to replace the steam of a real Locomotive by compressed air, and this for as much functions as possible. Here are the main functions : Movement of the train : Using 4 pistons, 2 on the sides, and 2 inside, the train can move forward. It works like a classic LPE, with 2 pistons shifted 90° from the others. 4 pistons consume a lot of air, but they guarantee enough power to move the whole train. To make the rotation smooth, a free wheel is hidden inside the boiler part of the locomotive. Its rotation is 25 times faster than the wheels of the train (40t/8t x2). The train isn't moving very fast because the pneumatic elements aren't modified. However, it's fast enough to make it interesting to look at the connecting rods and wheels moving. The breaks : On a real locomotive, compressed air is produced by a compressor (powered by steam) and is used to press some brake shoes against the wheels. Here, the same technique is used : a small piston is filled with compressed air, and thanks to some rods, brakes shoes are pressed against the wheels. It's cool but...it's not enough. Plastic against plastic isn't very efficient to stop the train's movement. Therefore, another rod is connected to the brake system and press another brake shoe against the free wheel. Because its rotation is faster (and therefore, with a low torque), it's is way easier to stop it. The Whistle : A system that I love in this locomotive is the whistle. Currently there isn't any whistle produced by Lego that could be used in the locomotive, so I had to think a little for finding something working. I can give you more details if you want but I used some lego parts that are empty inside and have a small aperture. By blowing air on these parts, we can produce a noise that is a little similar to a whistle noise. This whistle is activated by a switch in the cabin. The Cabin : Nothing much to say except that in contains 3 switches for the 3 main functions (whistle, wheel movement and brakes). There is also a pressure gauge showing the pressure coming from pumps. The train moves with a minimum of 1 bar. A 2-2.5 bars, the movement is faster. The air supply : There are several possibilities for the train : we can directly pump with Lego pumps, or store the air into 6 to 8 airtanks or produce the air with Lego motors and small pumps. For instance I use 4 pumps side by side, linked to some air tanks, but I don't what the final model should work. Maybe some motors and pumps could be cool ? The design : The hard part was to make the boiler of the locomotive. It's a little hard to make cylinders with Lego technic parts but, with flex axles passing through Technic beams, I managed to make something satisfying. Some details are visible on the locomotive, I tried to make it look a little crowded like a real locomotive with fake air/sand tanks, fake compressors and mechanical elements. It's probably possible to make it look better, but for instance I am happy with it. The rails are "homemade" with Lego bricks. The locomotive is too big of course to work on Lego railtracks. The wheels aren't perfectly flat so the train is "blocked" in position inside the rails. Therefore, the train can move foward cur cannot go out of the railtracks (which is great for a train). Finally, as a bonus functions, there are some bumpers at the front and back of the locomotive to imitate the real bumpers used to absorb small chocs on a Locomotive. That's it for now, I hope the model is interesting to you and if that's the case, don't hesitate to support it on Lego Ideas ! Click here to support on Lego Ideas If you have any question or comment, please reply to the post, I'll be glad to discuss with you !
Murdoch17 posted a topic in LEGO Train TechI based this model off of set 60009, (Helicopter Arrest) with the tools from set 10027, (Train Engine Shed) and the canopy specifically designed after the Roberts Shed at the Museum of Transportation in St. Louis, Missouri. This model is modular with the office connected to the shed via two Technic pins, and the roof and second floor connected to each other and the first floor by only a few studs. The 2-8-2 "Mikado" usually sits on the far track (near the rear of the office), while the 2-6-0 "Mogul" just barely fits on the near track. (near the rolling garage door) The building with the garage is the offices for the entire repair shop. Below the offices is where small parts are stored until the repaired engine is ready to go to it's home shed. The ground (or first) floor contains a lathe, drill press, and a vise to help maintain any engine that rolls into the workshop. This floor also features a garage which can house a small automobile of about 16 studs or less in length. The second floor contains a desk with chair, couch, & filing cabinets containing repair records. The office also contains a wood burning fireplace and a small deck by the stairs and over the garage. This picture here shows the inspection area, where mini figures scramble all over the engines to check for leaks, oil joints, and do last minute touch-ups to the paint. Here are the locomotives that go with this shed: 2-8-2 Mikado This engine is made up of four different models. This includes ScotNick1's 2-10-0 9F European steam engine, which was shortened to a 2-8-0. The second model is set 10194 Emerald Night, from which the rear truck was taken. The third model is Anthony Sava's Pacific 4-6-2 model and that comprises the inspiration for the tender. The boiler was inspired by the one in set 79111 Constitution Train Chase. Together, these different engines from four different eras and four separate builders come together to create this one steam engine. This model is actually a serious MOD of the Constitution Train Chase (set 79111) with Zephyr1934-designed piston design and Anthony Sava-inspired tender from his 4-6-2 "Pacific" with stripes from his 4-6-0 "Ten Wheeler". LDD file for the complete facility (minus steam engines): http://www.mocpages....1429721454m.lxf LDD file for the 2-8-2 "Mikado": http://www.mocpages....1429143369m.lxf LDD file for the 2-6-0 "Mogul": http://www.mocpages....1429819897m.lxf This is the completed facility and locomotives. Comment, questions, suggestions and complaints welcome! EDIT: added the Mogul's LDD file.