It looks post, but the color is different. What is the post for ?

https://i0.wp.com/saywhatjapan.com/wp-content/uploads/2018/06/DSC_1021.jpg?fit=3840%2C2160https://i0.wp.com/saywhatjapan.com/wp-content/uploads/2018/06/DSC_1021.jpg?resize=150%2C150TSHOSPITAL, OTHERSNiiza,post,Saitama,sta,stationIt looks post, but the color is different. What is the post for ?- POST PHOTO ! HELP TRANSLATE JAPANESE ! ALL FREE !! -