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1,285 Views· 07 May 2024

Cat Sized Lego Train


Austin Bryan
711 Subscribers

Building an RC Lego train that cats can ride in with 3D printed rails and wheels. My 2 cats Cookie and Muffin are tired of walking, they’d rather travel by Lego train.

Lego isn't designed for building a large train that can carry cats because it lacks large wheels and rails for smooth movement. To solve this, 3D printing was used to create these parts. The rail switches use magnets or rubber for automatic changing. The bogies have a suspension system to handle uneven tracks and curve tilts, with each wheel powered by a strong, compact Lego L motor. The axles are made of aluminium to avoid bending under the weight.

The bogies feature an automatic coupling system like those in American trains, which can be opened using air pressure.

The train's frame is flexible and only sturdy when combined with the outer shell, it keeps the train low for easy boarding. This frame also contains pipes for door operation and coupling, along with wiring for non-Lego LED lights.

The train is powered by 3 Lego Powered Up hubs, allowing for extra sensors to automate the train further.

The carriages are designed like trams, the only type suitable for transporting cats, as the cat's weight helps with wheel-rail friction. A standard locomotive would need to be very heavy to pull cat-filled carriages.

The train has an open roof for quick cat exits.

Programming was done with the Lego Powered Up app, enabling light color changes with direction and control over pneumatic valves through servos.

I introduced the cats gradually to the train to make sure they aren’t scared of it.


00:00 Sizing
00:50 Wheels
02:37 Coupling
04:25 Frame
05:08 Motors
06:13 Pneumatic
07:06 Lighting
07:57 Shell
09:10 App
09:57 Test Drive
11:23 Introduction Cats
12:28 Cats in Train

App for train control: Lego Powered Up
Lego Pneumatic parts from https://www.greengeckoworkshop.com
Lego metal axles: https://metal-technic-parts.com/collections/axles
Electric Bricks: https://brixotoyz.com/

3D Printer: https://shareasale.com/r.cfm?b=2353821&u=4247393&m=138211&urllink=&afftrack=
Modelling Software: https://www.shapr3d.com/
Filament Wheels: https://amzn.to/3P2SQKN
Filament Tracks: https://amzn.to/3P476mo
Filament Sleepers: https://amzn.to/3v0GITC

Please note: I get a commission if you buy via Amazon & Bambulab links above. Thanks for your support.

Where I get my Lego parts from: https://www.bricklink.com/v2/main.page

Geographer - Arpeggisynth
The Green Orbs - Snack Time


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