jet engine thomas project

hmm yes i'll try those
what is stock speed motor btw? my trackmaster 2009 henry is slower than slug

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Don't really know what a stock speed would be. I assume that it can vary from engine to engine.

gave the gearbox a wash, bit faster but still kinda slow
what's the best place to get tomy track in england?

Then you might want to try these inexpensive ones from Amazon...in this video from Custom Trackmasters

wasn't able to find them on UK amazon

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If you have a Hobby Shop near you may help you out especially if they deal in Remote Control Vehicles. See if there is something here that has similar attributes.
UK Mini Motors

i know there is a shop that sells remote control vehicles, but i don't know if they also repair

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But they may sell the motors Stain.