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Greater Bangkok commuter rail
Commuter rail at Hua Lamphong Railway Station
Overview
Owner	State Railway of Thailand
Locale	Bangkok Metropolitan Region and adjacent provinces
Transit type	Commuter rail
Number of lines	5 Lopburi Line Kaeng Khoi Line Prachinburi Line Ratchaburi Line Suphanburi Line
Operation
Operator(s)	State Railway of Thailand
Technical
System length	623 km (387 mi)
Track gauge	1,000 mm (3 ft 3+3⁄8 in)
Electrification	None use diesel locomotive or diesel multiple unit

Greater Bangkok commuter rail is a commuter rail system in Bangkok Metropolitan Region, Phra Nakhon Si Ayutthaya Province, Saraburi Province, Lopburi Province, Suphan Buri Province, Ratchaburi Province, Chacheongsao Province, Nakhon Nayok Province, Prachinburi Province, and Samut Songkhram Province. It runs from and to the outskirts of the city during the rush hour, and the passenger number is high. It is operated by State Railway of Thailand (SRT) that also operates inter-city rail. Commuter rail services always have number 3xx. Most of the system are double track.

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)^[1] between Wongwian Yai, Bangkok, and Samut Songkhram in Central Thailand. The line consist of two sections: the eastern Mahachai Line, which runs between Wongwian Yai and Mahachai; and the Ban Laem Line, which runs between Ban Laem and Maeklong. 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.^[2]

The Red Line Mass Transit System Project is a modern commuter rail system to serve the Bangkok Metropolitan Region. Part of the Mass Rapid Transit Master Plan in Bangkok Metropolitan Region, it consists of two lines, the Dark Red Line) running from Thammasat University's Rangsit campus to Maha Chai in Samut Sakhon Province, and the Light Red Line running from Sala Ya in Nakhon Pathom Province to Hua Mak in Bangkok, with both passing through Krung Thep Aphiwat Central Terminal which acts as a connecting hub to the MRT system at Bang Sue. The initial segments of the lines opened in 2021. Most of the railway runs alongside existing national railway tracks, eventually replacing them. Segments running through inner-city areas are elevated, and the system is electrified by overhead lines. The system is owned and is being developed by the State Railway of Thailand.^[3][4] Since the Red Lines run roughly along the alignment of the failed Hopewell Project, they have been described as a "Hopewell revival".^[5]

• Mass Rapid Transit Master Plan in Bangkok Metropolitan Region
• List of urban rail systems in Thailand
• MRT (Bangkok)
• BTS Skytrain
• Airport Rail Link (Bangkok)
• SRT Red Lines