The renew BTS skytrain Route map of Bangkok

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How many BTS lines are there in operation?

There are currently 2 operating lines: 

Sukhumvit Line (Light Green Line) covering 60 stations including 

Khu Khot, Yaek Kor Por Aor, Royal Thai Air Force museum, Bhumibol Adulyadej Hospital, Saphan Mai, Sai Yud, Phahonyothin59, Wat Phra Sri Mahathat, 11th Infantry Regiment, Bang Bua, Royal Forest Department, Kasetsart University, Sena Nikhom, Ratchayothin, Phahon Yothin24, Ha Yaek Lat Phrao, Mo Chit, Saphan Khwai, Ari, Sanam Pao, Victory Monument, Phaya Thai, Ratchathewi, Siam (Interchange station) Chit Lom, Phloen Chit, Nana, Asok, Phrom Phong, Thong Lo, Ekkamai, Phra Khanong, On Nut, Bang Chak, Punnawithi, Udom Suk, Bang Na, Bearing, Samrong, Pu Chao, Chang Erawan, Royal Thai Naval Academy, Pak Nam, Srinagarindra, Phraek Sa, Sai Luat and Kheha Silom Line (Dark Green Line) covering 13 stations including National Stadium ,Siam (Interchange station) Ratchadamri , Sala Daeng , Chong Nonsi , Saint Louis, Surasak , Saphan Taksin , Krung Thon Buri , Wongwian Yai , Pho Nimit , Talat Phlu, Wutthakat, Bang Wa.