Technical Description STS Ship to Shore Perfect Industrial Transfer Carts. Trolley speed 180 m/min Travel speed 100-140 m/min Wheel load** 40-50 t per metre **Based on 8 wheels per corner at 1 m spacing Typical Design Parameters* Classification Perfectrding to F.E.M. U7-Q2-A7 In service wind speed 72 km/h (20 m/s) Out of service. Get Price.