Delete ?
Warning: Adult Content
The content you were about to view is not suitable for minors.
The page that you are trying to access contains adult content, which may not be suited for minors. Please verify that you are aware of this, and are within legal age limit to access this content. Note that we take no responsibility for any content if you decide to proceed to this page as a minor.
Leave this page
I am an adult, continue
B&O No. 2400 "Old Maude"
Published 1 week ago
Drag & Drop

*.jpg or *.png
or browser file
Images posted in this section must comply with the Mecabricks rules. Please read carefully the rules before publishing.


No renderings uploaded yet
Affectionately dubbed "Old Maude," this is the common ancestor of Union Pacific Big Boy, Allegheny, the Southern Pacific Cab Forward, and all other American articulated steam locomotives. Old Maude's design originated from the demand for a more powerful locomotive to handle heavier trains. Traditionally this was solved by coupling an extra locomotive to the consist (known as double heading). However, this was not cost-effective when it was necessary to invest in additional locomotives. Furthermore, steam locomotives were being developed with more wheels on a rigid frame, which made it difficult for them to negotiate tighter curves designed for smaller engines. One solution was developed by Swiss mechanical engineer Anotle Mallet (French pronunciation Mal-lay), who in 1874 patented a "compound" locomotive that had two sets of drive wheels powered by their own set of cylinders; this allowed the engine to negotiate tighter curves. The steam would be fed into the rear set of high-pressure cylinders like a standard steam locomotive. However, instead of being discharged through the blast pipe in the smoke box, the exhaust steam is then fed into the larger low-pressure cylinders in the front wheelset. This system yielded a locomotive that had the power of 2 steam engines in one. Very soon, this concept was noticed by American railroads, and this locomotive was built by the American Locomotive Company (ALCO) in 1903.
I chose to build a moc of this locomotive to create something that hasn't been created in lego before. The development of this locomotive was relatively difficult, with multiple redesigns of the valve gear and other minor details. Even though there are some details I wish I could add to the model that is left out due to physical limitations in the model's design, I'm still happy with how the model turned out.
This is my second entry into the 2022 Brick Train Awards

Download model inventory: CSV | Bricklink XML
2707 pieces
Name of the part
Direct Link
Embed Viewer
Post comment
Login to comment
1 week ago
Golly,this is actual competition to my submission indeed

Best of luck to you!
1 week ago
Very nice! Certainly looks the part!
7 days ago
For my next build, I'm going to make either a diesel or electric
Does anyone have any ideas?
7 days ago
Diesel engine… one second…

What about the DR 877 "Flying Hamburger"?
(YES, that is a train…)
6 days ago
The English Electric Deltic prototype. One of my favorite BR diesels.
109 models | 17.1k views