I had doubts' sumbitting this piece, but I got a few reccomendations from friends so I hope you like it!  (5 or 6th pixel art I've made, the other 2 were failures!)
Also I realize this is not how a real subway actually looks, I was just using my imagination ><* | 
Your line weight changes on the bottom of your picture on the walkway leading into the subway at 3 different points, and it seems you just continued pixeling around it (considering you went in with the light grey and duplicated the same errors the black has) Just lazy to have submitted it without fixing baseline isometric no-no's as simple as those, among other things.