Heljan’s ‘O’ gauge Class 05 diesel shunter gets a digital sound makeover in HM135 to show the simplicity of upgrading to ‘O’ gauge sound with this 21-pin decoder fitted locomotive. Our project uses a Zimo MX644D decoder and ‘sugar cube’ speaker to create all the right noises. Watch it here and read the full installation guide in HM135 – on sale from August 9 2018.
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