Upgrading a Hornby Class A3 | TTS Digital Sound and CD Motor

I wanted to upgrade this Hornby Class A3 (R2201 'Robert the Devil') from being an anlogue model with a ringfield motor to being a digital sound fitted model with a CD drive motor. However, CD drive motors are a lot faster than ringfield motors and Hornby decoders don't have speed control features built in. This means that the models can run extremely fast even at low speed steps on the controller. To reduce the speed of the model I looked at adjusting the gearing on the motor and I was able to replace the pinion gear with a 9 tooth version. I also looked at the electronics and was able to add in resistors to reduce the voltage to the motor. Then I used the Back EMF settings to ensure that the model started on low speeds steps, had a nice slow speed crawl and pulled away smoothly. It's not a perfect solution since when the throttle is over 75% the model still runs far too quickly, but that's something I'll have to live with unless I want to fit a far more expensive sound decoder that has speed control functionality. Ebay and Amazon Affiliate Links (Full disclosure, as an Amazon Associate and Ebay partner I earn from qualifying purchases through these links and this helps to support the channel) Hornby Class A1/A3 Sound Decoder: https://amzn.to/3uGEfZt CD Motor Upgrades from Strathpeffer Junction: https://www.strathpefferjunction.com/ 9 Tooth Pinion Gear: https://ebay.us/mFyfgn Variety of 0.5 Watt Resistors: https://amzn.to/2OcZdhR Camera Equipment: Fuji Film X-T200: https://amzn.to/2ZV72eO Canon G7Xii: https://amzn.to/2ZWJN4f Cayer Tripod: https://amzn.to/3dTTdFR Lavalier Lapel Mic: https://amzn.to/3r3rFBy Studio Condenser Mic: https://amzn.to/3bNRijb Chapters 00:00 Introduction 00:58 Overview 02:50 Gearing 03:14 Electronics 04:47 Back EMF 07:06 Summary 07:42 Robert the Devil in action!