VIDEO: Upgraded Twin Track Sound Class 67 for ‘OO’


In HM137 showed how to install a Hornby Class 67 Twin Track Sound decoder in its high fidelity model of the Alstom built Bo-Bo diesel-electric and how to enhance its audio output with a new speaker. Listen to the model in action here and read the full step by step guide in HM137 which is available as a back issue from the Key Publishing Shop.

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