Class 21E Dual-Voltage Electric Locomotive
The freight locomotive (hereinafter referred to as SA 21E) is the first dual-voltage electric locomotive for Transnet Freight Rail developed in China, which has been further optimized upon SA 20E.
The locomotive’s axle load is 26 tons; starting effort is 380 kN; Maximum operating speed is 100km/h. Its carbody is of an integral monocoque construction and is welded by steel plates and profiled elements. It can withstand more than 4MN compressive load and tensile load. It is equipped with air brake system and WDP system(control system of hard wire distributed power), which are all in compliance with AAR Standard. Tow-axle narrow-gauge bogies are adopted. Traction device adopts low-positioned dual draw bar structure; traction motor is suspended in an axle-hung manner.
|Application||Freight service on main line|
Catenary voltage &
|Single-phase AC25kV / 50Hz or DC3000V|
|Track gauge||1065 mm|
|Whole weight||102 t|
|Max. operation speed||100 km/h|
|Traction power||3000 kW|
|Brake Power||3000 kW|
|Starting effort||380 kN|
|Electric brake mode|
Regenerative brake and
Max. electric brake