Last Updated: 16 June 2025

How to convert Dapol Class 142 142085 (ND116D) to DCC Sound

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This guide covers the following models:

The speaker and sound decoder are installed in the dummy car. For the optimal experience, we recommend also installing a decoder in the motorized car that is syncronized with the sound decoder.

Step 1 - Remove body

Remove the body by turning the unit upside down and unclipping the front where the plastic tapers inwards.

Convert Dapol Class 142 to DCC sound

Step 2 - Modify Decoder PCB

Undo the two screws holding the decoder PCB in place. Turn the PCB upside down and solder two brown wires to the solder pads marked 'Speaker +' (S+) and 'Speaker -' (S-).

Convert Dapol Class 142 to DCC sound

Step 3 - Fit Speaker

Fit the speaker into the centre void where the motor would ordinarily be. Secure it using glue or black tack, then solder the brown wires to the speaker terminals.

Convert Dapol Class 142 to DCC sound

Step 4 - Fit Decoder

Fit your sound decoder, replace the body and the conversion is complete.

Convert Dapol Class 142 to DCC sound