Cat Linh - Ha Dong (line 2A) is Hanoi's first urban railway line to come into operation, starting in November 2021 after 10 years of construction.
The project has a total initial investment of 8,769 billion VND. By 2017, total investment capital increased to 18,000 billion VND.
The entire route is 13km long, completely elevated, with 12 stations. The starting point is Cat Linh station (Cat Linh street, Ba Dinh district) and the ending point is Yen Nghia station (Yen Nghia bus station, Ha Dong district).

The Cat Linh - Ha Dong railway has 13 trains, each train consists of 4 cars, maximum capacity of 960 people/group, maximum speed of 80 km/h, operating speed of 35 km/h. The time it takes the train to travel the entire route is 23 minutes.
According to statistics, every day there are over 35,000 passengers using the Cat Linh - Ha Dong railway to travel, of which 47% are people going to work, 45% are people going to school and the remaining 8% are commuting. for other purposes.
Of which, passengers travel regularly with monthly tickets with an average daily rate of 70%, during peak hours accounting for more than 85%, contributing to reducing vehicle density on the route corridor, limiting congestion. traffic and environmental pollution.
After Cat Linh - Ha Dong, the Nhon - Hanoi station train also officially operated the elevated section commercially on August 8, after 14 years of people's expectations.
The milestone of opening and putting into commercial operation the Nhon - Hanoi station metro line also ended the "lonely" days of the Cat Linh - Ha Dong metro line.

Urban railway project No. 3, Nhon - Hanoi station section is 12.5km long, with 8 elevated stations and 4 underground stations. Of which the elevated section Nhon - Cau Giay is 8.5km long, the underground section Cau Giay - Hanoi station is 4km long.
The project started in 2009 and was scheduled to be completed in 2015, but progress was delayed many times, increasing capital from more than 18,000 billion VND to nearly 36,000 billion VND. The entire route is expected to be completed in 2027, the elevated section in August 2024.
Metro Nhon - Hanoi station has 10 trains, maximum speed of 80 km/h, average operating speed of 35 km/h. Each train consists of 4 cars, each car carries 236 passengers, each trip carries about 950 passengers.
According to information from Hanoi Metro, the Nhon - Cau Giay train has served nearly 300,000 passengers after 5 days of opening (from August 8 to August 12).
In particular, the number of passengers traveling to metro Nhon - Hanoi station on August 11 was recorded at up to 100,000 passengers, breaking the record of the busiest day of the Cat Linh - Ha Dong route (58,000 passengers on May 1, 2023).

Regarding the route, metro Nhon - Hanoi station and Cat Linh - Ha Dong will connect with each other at Cat Linh.
However, the underground section of metro Nhon - Hanoi station has not been completed, so in the immediate future the city will connect these two metro lines by public buses and bicycles.
In the long term, the city plans to build a tunnel connecting the two above-mentioned urban railway lines.
Hanoi Department of Transport said that it is studying to build a connection plan between Cat Linh elevated station (line 2A) and underground station S10 (line 3) within the red line boundary, implemented on Ba Dinh district and Dong Da district.
This agency proposes to follow option 2: Build walking tunnels, transfer rooms and have 2 connection directions.
Go to Cat Linh station (line 2A): up and down (stairs, escalators and elevators).
Take station S10 (line 3): connect to the transfer floor of station S10.
This is a group C project, total expected investment is about 113 billion VND.