The tool changing system is a combination of a standard transport trolley with a round rail system for moving heavy loads and an electric motor-driven pull-push chain or linear unit. Both systems in combination form a cost-effective and safe tool changing system for tools weighing up to 40 tons. The rollers of the round rails have very low rolling resistance, precise guidance and are well protected against contamination. The optimal solution for linked presses and the transport of heavy tools across several stations. Additional roller strips in the press, support brackets for bridging and quick-clamping systems in the press result in a complete system for quick and safe tool changes.