Metro carriages in southwest China's Chengdu city have been turned into a "moving museum," allowing commuters to learn about changes in daily life over the past 70 years.

Passengers of Chengdu Metro's Line 7 can start a trip back in time by viewing more than 300 old photos and copies of cultural relics displayed inside the carriages, including a land license from the 1950s, a marriage certificate from the 1960s and food coupons from the 1970s.

QR codes inside the metro also provide access for passengers to check out more information via their smartphones.

A passenger surnamed Yang said he was impressed by the significant changes in every aspect of Chinese people's lives over the past 70 years.

The themed metro museum was created by Chengdu Rail Transit Group and Sichuan Museum of Jianchuan in celebration of the 70th anniversary of the founding of the People's Republic of China.

"This is the first metro in Chengdu to feature images and cultural relics from the past, and also an innovation in China," said Zhou Xing, an official with Chengdu Rail Transit Group.

The city's metro passenger flow reaches nearly 4 million per day. The installation will last until Dec. 31.