The function of the rail transit coupler is to realize the connection between the locomotive and the freight car and the freight car and the freight car and transmit the traction force. Some special designs, such as closed couplers, not only transmit traction, but also withstand compressive forces and weight, such as the closed coupler used in intermodal trucks SGGRSS. The coupler transmits loads up to 2 000 kN according to UIC577 or EN12663. ELGES spherical plain bearings have been used in this field for more than 30 years. Initially, the maintenance-required steel/steel contact spherical plain bearing model was used, while the maintenance-free spherical plain bearing with high load-carrying capacity, long life and ELGOGLIDE sliding layer is widely used. This long-term development is aimed at realizing the needs of vehicle operators to reduce vehicle maintenance costs and downtime. The pantograph transmits electrical energy from the grid to the vehicle's electrical equipment. The pantograph must work reliably under various operating conditions. The actual working conditions are very complex, such as the operating speed is very high, more than 500 km/h; the working temperature is below 40 C, and the components are directly exposed to such climatic conditions without any protection. Bearings provided by Schaeffler Group have low friction, smooth operation and compact design, and at the same time can achieve the necessary rigidity and freedom, and have no adverse problems after years of practical application. Suffix description: two angular contact ball bearings in DB O configuration with zero clearance DF two angular contact ball bearings in X configuration with zero clearance DT two deep groove ball bearings in tandem configuration with zero clearance PP lip seal on both sides PR tertiary seal on both sides, including plastic thrust flat washer with integral sealing lip 2RSR lip seal on both sides ZW double row Other designs available on request.