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57 votes
Accepted

Can LEGO City Powered Up trains be automated?

I've been exploring this recently, and I wanted to share my experiences in the hopes that they are useful to others. There are a few ways this can be accomplished. Some are possible out of the box, ...
jncraton's user avatar
  • 40.7k
32 votes
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How can I motorize the Hogwarts Express (76423)

There are number of ways to accomplish this. The locomotive traditionally provides the power for a train, so that is a natural place to start. Unfortunately, this locomotive is difficult to motorize ...
jncraton's user avatar
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26 votes
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What are black sausage pieces used for in Crocodile Locomotive set 10277?

These are placed next to the magnets at the front and the back of the train. See step 142 in the instructions. 4 are needed and there is 1 spare. BrickInstructions shows it here:
Joost's user avatar
  • 8,053
25 votes
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Why was the monorail system discontinued?

According to https://forum.brickset.com/discussion/comment/57906/#Comment_57906 : The reason LEGO has stopped making monorail is threefold, One, the motors and track molds ran out and would be very ...
IvanSanchez's user avatar
  • 9,077
19 votes

Is there an API for the Duplo 10874 train set?

There is now official documentation for the Bluetooth protocol used by the Powered Up product line: https://github.com/LEGO/lego-ble-wireless-protocol-docs The community has created some tools to ...
jncraton's user avatar
  • 40.7k
17 votes

What piece is this? It's a hard one, and a very small one. It's 2x1 I believe, and it could possibly be an accessory

You are partially correct, it is made using two of Antenna Small Lever You can relax, they are not glued, but slotted into the grooves of the 1 x 2 Tile with grille The other wheels of the train are ...
Matthew Jensen's user avatar
16 votes
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Multiple Powered Up trains on 1 Bluetooth controller?

Each train needs the following two components: Hub Train motor I'll assume you purchased a second set of these to convert your 9V train with, since you're asking how to control both trains using the ...
LegoSonicBoy's user avatar
  • 2,988
16 votes
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Will Duplo trains fit onto a regular 6 stud LEGO track?

For this experiment we're using the wheeled Duplo push and go motor block and red cabin from Set #10874. The wheel width of the motor is the same width as a non motor base. So, for this train ...
Rin Rio-Oki's user avatar
  • 8,893
13 votes
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How tall is a Lego train on a track?

LEGO tracks are 12mm high, train wheels go below the true height of the track and so in reality only add 7mm of height. The structure gauge (also known as clearance) tolerance will obviously be a lot ...
Ambo100's user avatar
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12 votes
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6 x 14 plate with 2x12 plate molded on top and metal contacts on the bottom identification

Part# BB0054 - Electric, Train 4.5V Battery Car Roof. (But Light Gray in color.)
Rin Rio-Oki's user avatar
  • 8,893
11 votes

Why are there 4 wires leading to the Power Functions LEGO train motor?

The LEGO Power Functions connectors have 4 standard designations regardless of the usage: 9V power "0V" Ground C1 "control 1" C2 "control 2" It seems for motors that the 9V and Ground are unused. ...
chicks's user avatar
  • 5,273
10 votes

Website with layout plans for LEGO Duplo trains?

I'm not aware of any sites that are dedicated to DUPLO train layouts, but there are certainly interesting layout ideas out there. For example, this was included in set 2932: There are also loads of ...
jncraton's user avatar
  • 40.7k
10 votes

What is the function of Duplo part# 38507 RAIL ACCESSORY, NO. 4

It's an interactive piece that makes the train perform a cool(ish) function when it rolls over it. The train has a sensor on the bottom that reads the piece and does the deed. When the train reads ...
Rin Rio-Oki's user avatar
  • 8,893
10 votes
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Lego track switch doesn't close properly

Warning: LEGO pieces were harmed for this answer How the switch works So, how does it work then? Well, let's open it up! The back plate is held into place by 14 pins. We'll carefully pry it open ...
Uli's user avatar
  • 2,548
10 votes

Options for powering Winter Holiday Train

If you want to “turn on and forget” you might want to look into obtaining a circle of old 9V track (metal rails produced by LEGO until 2007) and a power supply, plus a 9V train motor. It will not be ...
Phil B.'s user avatar
  • 16.9k
10 votes

Minimal mine track

I think you want to consider using the 4-stud-wide "rollercoaster" tracks, part numbers 25059, 25061 and 26022. Here's how those to parts look like in set 60228: The straight track are 8 or ...
IvanSanchez's user avatar
  • 9,077
10 votes

Why does my 60198 train get lots of wheel spin?

Slipping of a wheel is caused by a too low friction between the wheel and the surface. The most straightforward solution would be to reduce the mass of the carriages the locomotive has to pull, but ...
zovits's user avatar
  • 16.8k
9 votes
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What is this "patent pending" part?

It's a tie plate from the original 4.5V train system, specifically from a "switch point right": http://www.bricklink.com/v2/catalog/catalogitem.page?P=x879cx1#T=C
Móż's user avatar
  • 2,072
9 votes
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What is the length of a DUPLO train bridge?

Based on the layouts from this answer, a half-bridge seems to be 2 straight tracks + 1 quarter-circle (split mid-track at the end, because the middle of the bridge is centered with the crossing track ...
André Fernandes's user avatar
9 votes

Are only two new train sets available in August 2018?

Those are the two City-themed trains that are currently available. LEGO is currently transitioning to a new electrical system for trains, so that may explain the relatively low number of trains ...
jncraton's user avatar
  • 40.7k
9 votes

Are only two new train sets available in August 2018?

As jncraton noted LEGO is going through a transitional time now. Sadly trains are not a huge portion of their sales so it tends to ebb and flow through time anyway. So if you want a train definitely ...
chicks's user avatar
  • 5,273
9 votes
Accepted

Train level crossing using 2021 road plates

It occurred to me that you could use 8-stud-long tiles, tilted ~3 degrees, resting on plates at different heights. Side view from a quick LeoCAD mock-up: Since clipping the tile to plates at ...
IvanSanchez's user avatar
  • 9,077
9 votes

Is there any difference in the power, wheel, and track technology between 2018 trains and 2022 trains?

Most of essential bits are the same and used in all 4 sets: Train motor Straight track Track switch Driving wheels attached to motor The only difference is in wheel used for cars. Instead of using ...
Alex's user avatar
  • 23.2k
9 votes

Identify this part, looks like a black handheld controller

A quick image search points to part 40529c01, which appeared only in two sets from 2006: 7897-1 Passenger Train and 7898-1 Cargo Train Deluxe.
IvanSanchez's user avatar
  • 9,077
8 votes
Accepted

Long train Bridge tension and compression angles (minimum brick count)

The compression member in your design looks thin to me, and the tension member oversize (assuming they are the top and bottom respectively). I would use string for tension and the technic beams for ...
Móż's user avatar
  • 2,072
8 votes

Is there an API for the Duplo 10874 train set?

Official docs: https://lego.github.io/lego-ble-wireless-protocol-docs/ https://github.com/LEGO/lego-ble-wireless-protocol-docs Discussion: https://www.eurobricks.com/forum/index.php?/forums/topic/...
handle's user avatar
  • 181
8 votes
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How to disassemble the propulsion wheels of the LEGO/DUPLO train engine base part# 28743 drivetrain?

My back wheels do the same thing. There is no metal axle that connects both back wheels like the axle design does for the front wheels, but I'm sure LEGO designed it that way. So, imagine the train'...
Rin Rio-Oki's user avatar
  • 8,893
8 votes

60197 Passenger Train control problem

I thought I’d update you on the situation for anyone else in a similar position. I got in touch with Lego via email, it took a while for them to get back due to the COVID-19 pandemic, which is totally ...
Tim Forsyth's user avatar
7 votes
Accepted

Can the DUPLO My First Number Train fit on DUPLO tracks?

Not really - the wheels on "My First Number Train" are the DUPLO car wheels, so they will just about fit on straight and curved track, but they won't work on the points and bridge sections. There isn'...
Zhaph - Ben Duguid's user avatar
7 votes

Duplo Locomotive: What is this inner part used for?

They are protective locks. If something (let’s say kids hair, or part of their clothes) gets stuck and dragged inside the wheel, these tiny blocks will lock the wheels and make sure it doesn’t keep ...
Jeroen's user avatar
  • 243

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