maxi-model
UK/US/ROW steam narrow gauge railways 1:1
I've never used below R3 Thank you for the guide. However, could the track geometry, offering too tight a curve R1/R2, be part of the problem ? If everything, apart from the loco is bogied stock, with truck, not body mounted couplings (?) Issue may only show up with the loco. Ease the curves ? But then you will end up with an octagon or a hexadecagon. Just a thought. MaxR1 - 30 degree x 12 = 360
R2 - 30 degree x 12 = 360
R3 - 22.5 degree x 16 = 360
R5 - 15 degree x 24 = 360