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Hi Brett, Well the shell does amplify the noise, no doubt about that. Thing is, this is only when running under DCC. The unit runs very sweetly and quietly indeed on DC power. On stripping the unit down ( not something to do every 5 minutes) I noticed the following. (1) The universals attached to the motor shafts are way out of alignment and sit at an angle. This causes a thumping action at low speeds, but appears to even out somewhat as you increase the power. I did some tweaking with them and they now sit a bit better, but not perfect. (2) The power bogie at the short hood end of the GP50 had a decided wobble to it. I tightened the screw a bit and this got rid of the wobble alright, but kept derailing the engine. Slackened of a bit and now perfect. As I said, this unit runs perfectly under DC, I firmly believe therefore, that the decoder is causing the noise. As I am 100 Klms from a hobby shop, I will run & enjoy the thing on DC until I get to the shop end of next week and buy a decent silent decoder. Thanks for your input. David
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