Drive for a locomotive

Three wheel sets of a locomotive are powered and can move in horizotal plane to adapt to the curves of the railway. The green bearings of front and rear wheelsets pivot on the chassis. The blue bearing of center wheelset can laterally displace thanks to key sliding joint on the grey center inner shaft. Blue and green bearings are connected together by pink sliders. So when the locomotive enters a railway curve, the front green bearing turns and makes the blue bearing move laterally and the rear green beari