Questions tagged [12v]

12V was a voltage standard for LEGO Trains sets from 1969-1993. It is no longer used in any modern products by LEGO.

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2answers
471 views

How can I repair a red 12v train motor from Set# 7730?

I have a LEGO 7865 Red 12 volt train motor from a LEGO 7730 train set. The motor has stopped working as it has been dropped on one of the wheels. How can I open the motor case to effect a repair?
3
votes
1answer
543 views

Lego 12v motor axle repair

I had recently got my Lego 7730 for past Christmas and wanted to use it. I bought the Lego 7864 and went to test the red motor but all I heard was the motor and it didn't move. I decided to take a ...
7
votes
1answer
277 views

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

This question is somewhat related to a similar question I asked about whether pushing a 12V train motor (such as the one below) would damage it. See title "Set 7865: six wheeled Lego® train motor (...
6
votes
1answer
550 views

How did the LEGO 7862 Remote Controlled Decoupling and Signal work?

I've never seen this set in person, although it appears occasionally in 12V Lego train system images. I've never seen it used, or described. How did the LEGO 7862 Remote Controlled Decoupling and ...
6
votes
1answer
269 views

Will playing with a 12V train motor by hand damage it?

This question is similar to one for PF motors. The 12V motor bogie has considerably more resistance than does the newer PF bogie motor, which may be moved very easily when not operating. So, if one ...
7
votes
1answer
2k views

Which train motor is more powerful, 9V or 12V?

I recently picked up LEGO bricks again and due to lack of space I'm planning to build a multilevel train layout. I do have a descent amount of 12V track along with trains and switch points, but I was ...
8
votes
1answer
4k views

LEGO Trains 12v: Identify This?

This is a very popular picture, which almost all LEGO Trains' fans from 1980s would recognize. I have the train in the forground, 7740, but not the 4th car (red one). Can anyone please clarify that ...
11
votes
3answers
6k views

Can I use the old 12V rails with the remote trains?

I have a bunch of old 12v track. I am looking to get my son into LEGO, but I am thinking of getting the remote set so we can expand it some more. My question is, can I connect the new track to the ...
7
votes
2answers
396 views

Electric, Plug Holder 4.5V/12V what is it for?

I have seen the Electric, Plug Holder 4.5V/12V on bricklink a few times and have often wondered what it is for. According to Bricklink, it was only ever produced in Light Gray and appeared in 3 sets ...
10
votes
2answers
692 views

Are the blue and grey 12v train system compatible?

Are the two generations of 12v train compatible? Eg can you combine a "blue" remote controlled point and a "grey" 12v transformer? Main motivation for this: I have a complete "grey" set of trains, ...
9
votes
2answers
865 views

What was the 12v AC socket for on the 7864 transformer?

The 7864 transformer had, in addition of the main regulated outlet for controlling trains and a fixed 12v DC for plugging in remote controls and lights, a third socket available which provided 12v AC. ...