“Seven Minutes Miracle”-Japan’s train-cleaning crews clean the Shinkansen in only seven minutes  (function(d, s, id) {   var js, fjs = d.getElementsByTagName(s)[0];   if (d.getElementById(id)) return;   js = d.createElement(s); js.id = id;   js.src = &quot;//connect.facebook.net/en_GB/all.js#xfbml=1&quot;;   fjs.parentNode.insertBefore(js, fjs); }(document, &quot;script&quot;, &quot;facebook-jssdk&quot;));   Shinkansen is a network of high-speed railway lines in Japan operated by four Japan Railways