Guided vehicle with steered axles

A guided vehicle comprising a body, first and second axles each comprising two wheels, first and second mount members bearing said body and mounted on said first and second axles respectively, and being adapted to traverse a curved track having a mean radius, said mount members being mounted pivotally to said body to rotate about respective first and second axes of rotation, said vehicle having a roll axis, first and second coupling means for coupling said vehicle to further vehicles at respective coupling points so that during a roll movement of said vehicle the coupling point associated with said each coupling means does not move relative to an adjacent axle far enough to disturb the radial positioning of the adjacent axle relative to the curved track, said coupling means being mounted on said body to pivot about respective pivot points and being connected to said mount members at respective contact points whereby to steer said mount members and said first and second axles, the distance a between said first and second axes of rotation, the distance n between said pivot point of each coupling member and the axis of rotation of the corresponding mount member, the distance b between said axis of rotation and said contact point, and the distance d between said coupling point and said pivot point of each coupling member satisfying substantially the equation:

• ##EQU5## said pivot point of each said coupling means on said body being disposed at least immediately adjacent to the roll axis of said vehicle.