The Maeklong Railway (also known as the Mae Klong Railway) is a 1,000 mm (3 ft 3 3⁄8 in) (metre gauge) railway that runs for nearly 67 kilometres (42 mi) between Wongwian Yai, Bangkok, and Samut Songkhram in central Thailand. The line consists of two sections: the eastern Mahachai Line, which runs between Samut Sakhon and Wongwian Yai with 18 stations, and the Ban Laem Line, which runs between Samut Sakhon and Samut Songkhram with 15 stations. The two stretches are separated by the Tha Chin River at Samut Sakhon. The only way to connect between the stations on the opposite sides of the river is by boat.
The railway became famous for its route through the Maeklong Railway Market, nicknamed (Thai: ตลาดร่มหุบ; RTGS: Talat Rom Hup), meaning the “umbrella pulldown market”. It is one of the largest fresh seafood markets in Thailand, and is centred on the Maeklong Railway’s track. Whenever a train approaches, the awnings and shop fronts are moved back from the rails, to be replaced once the train has passed.
Seventeen trains run daily in each direction between Samut Sakhon and Wongwian Yai.Four trains run daily between Samut Sakhon and Samut Songkhram. The railway is one of the slowest in Thailand, and the average speed for the whole line is only 30 km/hr. There are no signals on the line.