Chengdu metro line 4 of Phase 2 in western China has begun commercial service, following the start of Phase 1 operations in December 2015.

Alstom has provided the traction system for the entire Chengdu metro line 4 under two separate contracts from Chengdu Metro Group in 2013 and 2015 respectively, which includes 324 metro cars.

The OptONIX traction system has been specifically designed and developed for Chinese operations and is equipped with traction inverters, motors and auxiliary converters, along with a train monitoring system.

The system uses regenerative electrical braking to enhance operational performance and reduce overall lifecycle costs.

All the traction systems are manufactured by Alstom’s Shanghai Alstom Transport Electrical Equipment joint venture in China, in collaboration with Xi’an Alstom Yongji Electric Equipment and four other European Alstom sites.

"We are proud to have contributed to the completion of the Chengdu metro line 4, which provides reliable, efficient and green transport solution for residents and visitors."

Alstom China and East Asia managing director Ling Fang said: “We are proud to have contributed to the completion of the Chengdu metro line 4, which provides reliable, efficient and green transport solution for residents and visitors.

“As the global leader in sustainable mobility, Alstom will continue introducing its world advanced and innovative technology to Chengdu, and transforming Chengdu to be a National Core City with the latest technologies.”

Chengdu Line 4 forms part of the city’s core metro network, along with Line 1, Line 2 and Line 3.

The 41.3km-long Line 4 service comprises 30 stations and connects the western and eastern part of the city.