Dual-voltage suburban line opened in Chongqing
https://www.railwaygazette.com/passenger/dual-voltage-suburban-line-opened-in-chongqing/62383.article
It's unclear why there is a section electrified at 1·5 kV DC. If there is an observation facility of geomagnetism, I can understand there is a section electrified at 25 kV 50 Hz. But, the railway is basically electrified at 25 kV 50 Hz. So, partial electrification at 1·5 kV DC is not necessary. It's strange.
