The Mass Rapid Transit Authority ( of Thailand) , or MRTA ( or usually just MRT ) is work of engineering genius. Although at present there's only one line . the MRT take you from northern Bangkok. Although at present there's only one line . the MRT take you from northern Bangkok( Bang -sue-near a railway connection) to just south of the centre ( Huelum phong - Bangkok's main railway station) at the phenomenal rate. The other station where you can join the BTS from the MRT is Asoke. There is simply no aspect of this underground railway system that isn't impressive. One question you will ask youself is why the station need to be so big. They are genuinely big; absolutely enormous - akin to what most people imagine sophisticated underground nuclear shelters might look like! they are though ultra modern -MRT station ooze glass ,chrome and steel giving them a very futuristic look. Payment for your journey is easy. You just put money in the machines and your receive a small .black disc. Alternatively ,you can purchase a smart card and continually recharge the card. Tab the disc or the smart card on a small window at the barrier and your again entry into the station. Then take the escalators down into the bowels of the earth to pick up your ride. When the trains arrive doors slide open the allow people on and off. The cost of the MRT obviously depends on number of stations you visit. Like the BTS there are a number of special deals available for visitors.