This teardown is not a repair guide. To repair your Thomas Ride On Train, use our service manual.

Image 1/1: When power is applied to the charging connector it activates a relay which disconnects the power to the main circuits.
  • System Components

  • When power is applied to the charging connector it activates a relay which disconnects the power to the main circuits.

  • The main powerswitch is under the large yellow lever and simply applies power from the battery to the control board in the console.

  • A multipole switch is used to reverse the direction of the motor

  • An LED in the console flashes with the sound

  • The sound is provided by a loudspeaker in the base

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Image 1/2: The charging connector is on the rear of the train between the buffers Image 2/2: My connector is a "old style" connector which is effectively a phono, the new style is a more conventional power connector
  • Charging Connector

  • The charging connector is on the rear of the train between the buffers

  • My connector is a "old style" connector which is effectively a phono, the new style is a more conventional power connector

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Image 1/1:
  • Power Switch and Charging Relay Board

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Image 1/1: Note the fuse on the positive connector
  • This battery has been replaced, the originals attach via a clip

  • Note the fuse on the positive connector

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Image 1/1: Middle position is off, the other two positions are forward and backwards
  • This switch is controlled by the level on the console and switches the polarity of the motor connectors.

  • Middle position is off, the other two positions are forward and backwards

  • If you are replacing the LED don't forget that the polarity of the wires is important

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Image 1/1:
  • Has three switches to activate the music and connectors leading off to the motor, speaker, LED and battery

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Image 1/1:
  • This is a 16ohm speaker

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Image 1/1:
  • 6v electric motor with capacitor for noise and spark suppressor wired across the terminals

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Andy from Workshopshed

Member since: 05/21/2013

380 Reputation

3 Guides authored

8 Comments

sound their but it's stoped moving

Leona - Reply

If you've got sound but no movement then the most likely cause is the battery is discharged or defective. If you have a multimeter you could check the voltage on the battery.

If may also be a motor / mechanical issue. With the power disconnected you should be able to rotate the wheels but it won't spin freely as there is a gearbox.

Andy from Workshopshed -

Movement but no sound? Been charged

Shiipwreck Flynn - Reply

That could be a problem with the sound board which lives inside the steering wheel. It's quite a challenge to get to that which is what caused me to write the guide in the first place. I had to clean the switches on that board to get mine to work.

Alternatively could be a loose or broken wire on the speaker which is down in the base, one of the first things you get too when stripping it down.

Andy from Workshopshed -

What do I clean it with? Just polish? Had a look. Wires look fine so im confused lol

Shiipwreck Flynn -

You don't need to clean the speaker, you might need to clean the sound switch contacts though. For that you need to get to the control board. If you can get some contact cleaner that is best or just a cotton bud and a dab of water should also work.

Andy from Workshopshed -

Hi Andy,

Thanks for the article, the sound board on my sons Thomas has fried - are you aware of any spare parts available anywhere?

Or alternatively - do you have any closeup photos of your sound board? That way I can try to repair it myself.

Many thanks

Andy

awbuckland - Reply

Hi Andy,

I'm afraid I don't have a better photo and the train got sent back to the charity shop after my daughter got too large.

However, from what I remember there's a black blob which is the "brain" of the board, a few connectors and some primitive buttons.

Things to look for are:

* Dirt on the connector pads for the buttons, clear with a PCB cleaning block or wire wool if you can't get a cleaning block

* Loose or broken connectors, resolder these

* Cracks in the PCB tracks (these could be hard to find) you could fix with "conductive paint"

If you are a bit more advanced with electronics, then you could also swap out that board with something else. I did a quick google for "sound effect module" produced a result which might work

Velleman MK134 - Steam Engine Sound Generator Electronic Kit

You'd also need to be a bit handy with a dremel or the like to ensure you had space for it.

all the best.

Andy

Andy from Workshopshed - Reply

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