Dual-Voltage Electric Locomotive
in Africa

Class SA 21E

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.

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.

Technical Parameters

Application	Freight Service on Mainline
Axle Arrangement	Bo-Bo
Catenary Voltage & Frequency	Single-Phase AC 25 kV / 50 Hz or DC 3000 V
Track Gauge	1 065 mm
Total Weight	102 t
Max. Operation Speed	100 km/h
Traction Power	3 000 kW
Brake Power	3 000 kW
Starting Effort	380 kN
Electric Brake Mode	Regenerative Brake and Resistance Brake
Max. Electric Brake Effort	200 kN