Ron Wallman
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My other loco is smoking nowWithout having any lucrative connections with 4QD it may be the time to fit one of their speed controls.
I think your riding car does not have much suspension or compensation. If I am right, you need it. One solution would be to drill out the “axle box” so that the bogie can flex and the wheel sets follow the track. If there are ball bearings, allow them to waggle in the housings. This sounds dreadful practice and it is but it does work rather well. Doug Hewson has riding trolleys that have loose mounted bearings. Do not use self aligning bearings. I tried this on my coal wagon and they are a pain in the.... I would guess that not much more than a flange depth of play (3.6 m) is all that is needed.
For tight curves free wheels work well. Our tramways around Paris T1, T2 and T4 all have free wheels. Hardy anybody knows where T3 is and I think may have them too but it is run by the SNCF and capable of 70 MPH.
When I ran at the local school I needed a box full of packing to locally level the line. That might solve some problems too.
It is a pity I am remote as I have a modest workshop and could probably fix the problem.
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