I have a BLI T-1 that has so far had a decoder replaced, it then tore a tooth off a gear, I obtained the spare gears along with a traction tire less rear driver set, now the loco derails on the club layouts 36" radius curves, and large radius Peco turnouts but only when on a right hand curve, I increased the spring length in the front driver set without change. Prior to fitting the new rear driver set, the traction tire wheels had shed their traction tires and the loco performed flawlessly untill the gear tooth sheared off, all wheel sets match the NMRA Gauge.
Any suggestions welcome.
Ted (Teditor) Freeman from the Land Down Under.