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Tenderlok posted a topic in LEGO Train TechDear fellow AFOLs, it’s been quite a long time since my last MOC, but finally, I am proud to present another one. And I dare say that the waiting was quite worth it… But let’s take one thing at a time: I’ve always loved Swedish steam locomotives for their clean, elegant lines, their beautiful colour scheme and those massive snowploughs ; so when the Mallet project I announced a few months ago had failed, I thought it was time for an old Scandinavian lady in 1/33 scale – the TGOJ M3a No. 104. The prototype is a three-cylinder 0-8-2 tank engine (did I mention that I love tank engines, too?). Four of these locomotives were built between 1928 and 1930 by Nydqvist & Holm AB (NOHAB) in Trollhättan, Sweden, and delivered to Frövi-Ludvika railway, where they were classified as Litt. M3a, nos. 101–104. From 1931 on, the engines were operated by TGOJ (Trafikaktiebolaget Grängesberg–Oxelösunds Järnvägar). They were used primarily in freight service, e.g. for hauling ore trains to the harbours on the Baltic Sea. While engines 102–104 were scrapped in 1975, no. 101 is preserved at the railway museum in Grängesberg. The model consists of ca. 2100 parts and weighs about 1.4 kg. It features a working reproduction of the inner cylinder and a realistic frame with prototypic cutouts, inside-mounted equalizing beams, and brakes. The cab interior is as detailed as possible, given that the battery box is placed inside the cab. Two L-motors, controlled via one IR receiver (V2), are working directly on the fourth axle; the first to third axles are driven by the side rods. All the rods were made to measure by zephyr1934 (and I really want to thank him for this great job!), while the wheels are BBB XL and Medium ones. Enough said, here are the pictures: The frame during construction, showing the prototypical inclination (approx. 6,7°) of the middle cylinder, which allows the connecting rod to clear the first axle: Two more views of the frame. You can see the equalizing beam between the first and second axle as well as the one between the third and fourth: The motors are situated in the side tanks and in the lower half of the boiler: A longitudinal section (render). The red boat weight brick improves weight distribution: Some cab side detail. Note the small windshield glass between the windows: Self-made stickers: The rear windows are barred, to prevent them from being damaged while taking coal: The roof is detachable for easy access to the on/off switch and the charging socket. You can also see the rudimentary cab interior: Finally, here’s a video, showing the locomotive in action. Despite its long wheelbase, the model is able to negotiate LGB R3 curves and switches, as the trailing axle (Bissell type) swings out both radially and laterally (Note: The brakes between third and fourth axle are for display only. In operation, they have to be removed; otherwise, they rub against the fourth axle’s flange and make a terrible noise). As usual, you will find larger versions of the pictures in my Bricksafe folder. You can also download the LXF there. Thanks for your kind interest! Best wishes, Sven Edit: New videos here!