PURPOSE: To provide the subject system intended to convey fully wound roving bobbins and empty tubes in a spinning equipment.

CONSTITUTION: This suspension trolley-rail system has such a scheme that rail sections 10, 11 and 12 between a total of three types of operating units provided in the rail system, namely a flyer 2, a ring spinning frame 4 and a bobbin cleaner 5, are offered as a central buffering element accessible thereto for a suspension trolley by the aid of triangular track systems 16, 17, 18 where buffering elements 13, 13' and 13" are properly laid and the connective sections 15, 19 and 23 therefor.