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25 votes
Accepted

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:
  • 7,413
17 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 ...
  • 34.9k
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 ...
16 votes
Accepted

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 ...
  • 8,748
14 votes
Accepted

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 ...
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13 votes
Accepted

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.)
  • 8,748
12 votes
Accepted

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 ...
  • 17.4k
11 votes

Can I build a faster LEGO train motor?

Mathematically, the largest driver wheel you can buy for LEGO is Big Ben's XL driver, with a diameter of 36.8mm. To reach 10 mph, that wheel will have to spin: 36.8 mm diameter -> 115.6 mm ...
  • 2,170
11 votes
Accepted

Is this a real Duplo Train Base or fake?

These 10 are Duplo Vehicle Car Base 2 x 6 with Hitches and Red Wheels (Old)' (4883cx2) and came in Red, Blue and Yellow
  • 7,413
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 ...
  • 34.9k
10 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. ...
  • 5,110
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 ...
  • 16.5k
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 ...
  • 4,893
9 votes

Lego remote controlled cargo train not working

The best way to solve this type of problem is to break it down and isolate the fault. You might find that it is easier to remove the Power Functions components from the model for some of the ...
  • 8,951
9 votes

How many flexible tracks does it take to make a complete oval?

Each piece of flex track is equivalent to 1/4 piece of regular track. The standard train curves are 1/16th of a circle and thus an oval shape is not possible, however, with 64 pieces of flex track you ...
9 votes
Accepted

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 ...
9 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 ...
  • 8,748
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 ...
  • 34.9k
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 ...
  • 5,110
9 votes
Accepted

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 ...
  • 2,488
8 votes

How to build bridge using 4.5/12v train rails from 1969 Lego brochure

I just built the bridge yesterday. I didn't have all the parts so had to be creative at some points. I'll improve some joints once I picked up more of my Lego at my dads' place. Very funny project! ...
  • 1,156
8 votes
Accepted

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
  • 2,022
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 ...
  • 2,022
7 votes

Can I build a faster LEGO train motor?

10 mph (16km/h) is a crazy speed at that scale [citation needed]. Chances are quite high that your car will derail even on straight lines. Now, is it possible to reach that speed using lego motors ...
7 votes
Accepted

What are the largest LEGO® Power train sets available commercially [Oct 2014]

Right now, the largest commercially available train is the Lego City Cargo Train, Set 60052. It comes in at about 887 pieces. There are 30 rail pieces in this kit. Extra rail pieces are also ...
7 votes

How many flexible tracks does it take to make a complete oval?

The flexible tracks are not designed to make a full oval, but to add subtle, smaller curves in a train layout, using just a few at a time. If you do use too many flexible tracks next to each other ...
7 votes
Accepted

What prevents a 12V motor, when pushed by hand, from providing DC electric out?

The 12v train motor uses 2-pole 3-slot technology. Because of thinner, but longer wire which results in a greater resistance and will create higher voltage, but lower current the current output isn't ...
  • 1,156
7 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/...
  • 171
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 ...
  • 233
7 votes
Accepted

Is there a hobbyist standard for Trains track modules?

Yes there is, and the standard is not unique to trains, but rather applicable to all LEGO construction. It is called MILS (Modular Integrated Landscaping System). You can find its specification in ...
  • 16.5k

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