The Rapid KL Train System is a public light rail train transport network that comprises of 3 train lines to serve a part of the needs of the people in the growing city of Kuala Lumpur. It is owned by Syarikat Prasarana Negara Berhad, a GLC (Government linked company) since operation began in 1995. 

The RapidKL network comprises of:
- two Light Rail Transit (LRT) lines running from (a) Masjid Ampang to Ampang in one direction and (b) from Masjid Ampang to Kelana Jaya in the opposite direction and
- the KL Monorail, running from Sentul to KL Sentral.

There are a total of 60 stations or train stops with about 65 kilometres of rail between the three lines. Plans are underway to extend the lines to cover a greater area of Kuala Lumpur and its suburbs.

The trains are gaining popularity amongst KLites as the train stations are well-maintained and clean and the train frequencies are also very acceptable at no more than 5 minutes before the next train arrives.

Service starts at 6am and ends at 11pm although the service times are sometimes extended when there are important public events in the city.