What is written on it ? And what is the arrow showing?

https://i1.wp.com/saywhatjapan.com/wp-content/uploads/2018/05/DSC_0887-960x540.jpg?fit=960%2C540https://i1.wp.com/saywhatjapan.com/wp-content/uploads/2018/05/DSC_0887-960x540.jpg?resize=150%2C150TSTRANSPORTATIONattention,platform,shinjuku,sta,stationWhat is written on it ? And what is the arrow showing?- POST PHOTO ! HELP TRANSLATE JAPANESE ! ALL FREE !! -