Rail transport in Bangkok

The State Railway of Thailand (SRT), founded in 1890, is the oldest operating railway operator in Bangkok. It'd not be until 1897 when SRT operates its first train service. The SRT remains the only railway operator that operates train service between Bangkok Metropolitan Region and other parts of the country.

Although proposals for the development of rapid transit in Bangkok had been made since 1975, leading to plans for the failed Lavalin Skytrain, it was only in 1999 that Thailand's first rapid transit lines would begin operation. Those are Sukhumvit Line and Silom Line of the BTS Skytrain. In 2004, Blue Line began operation. Blue line is notable as the country's first rapid transit line with an underground section. In 2010, Airport Rail Link, a line linking Phaya Thai station with Suvarnabhumi Airport began operation. It is notable as the country's first rapid transit line to serve an airport. Bangkok BRT also starts operation in 2010.

More lines began operation in the following years. In 2016, Purple Line began operation. In 2020, Gold Line began operation. In 2021, the SRT Red Lines, consisting of SRT Dark Red Line and SRT Light Red Line. In 2023, the country's first two monorail lines, the Yellow Line and Pink Line, began operation.