Here is a list of gifs showing the expansion in various cities. Shanghai (http://www.thatsmags.com/uploads/galleries/images/shanghai-metro-gif.gif http://www.t

Here is a list of gifs showing the expansion in various cities. Shanghai (http://www.thatsmags.com/uploads/galleries/images/shanghai-metro-gif.gif http://www.thatsmags.com/uploads/galleries/images/shanghai-m...) Toronto (http://www.thatsmags.com/uploads/galleries/images/toronto-metro-gif.gif http://www.thatsmags.com/uploads/galleries/images/toronto-me...) Beijing (http://big.assets.huffingtonpost.com/subwaygif2-01.gif http://big.assets.huffingtonpost.com/subwaygif2-01.gif) Moscow (https://upload.wikimedia.org/wikipedia/commons/c/c0/%D0%9C%D0%BE%D1%81%D0%BA%D0%BE%D0%B2%D1%81%D0%BA%D0%BE%D0%B5_%D0%BC%D0%B5%D1%82%D1%80%D0%BE.gif https://upload.wikimedia.org/wikipedia/commons/c/c0/%D0%9C%D...) New York (https://secondavesagas.files.wordpress.com/2007/09/subwayhistory.gif https://secondavesagas.files.wordpress.com/2007/09/subwayhis...)