suburban rail system
... that Kolkata, the smallest by area of India's six A-1 cities, has the country's largest suburban rail system by track length and number of stations ?
... that <a href="./Kolkata" id="mwA9o" rel="mw:WikiLink" title="Kolkata">Kolkata</a>, the smallest by area of India's six <a href="./Classification_of_Indian_cities#Historical_classification" id="mwA9s" rel="mw:WikiLink" title="Classification of Indian cities"><span about="#mwt58" class="nowrap" data-mw='{"parts":[{"template":{"target":{"wt":"nowrap","href":"./Template:Nowrap"},"params":{"1":{"wt":"A-1"}},"i":0}}]}' id="mwA9w" typeof="mw:Transclusion">A-1</span> cities</a>, has the country's largest <b id="mwA90"><a href="./Kolkata_Suburban_Railway" id="mwA94" rel="mw:WikiLink" title="Kolkata Suburban Railway">suburban rail system</a></b> by track length and number of stations <i id="mwA98">(one pictured)</i><span about="#mwt57" data-mw='{"parts":[{"template":{"target":{"wt":"-?","href":"./Template:-%3F"},"params":{},"i":0}}]}' id="mwA-A" style="padding-left:0.15em;" typeof="mw:Transclusion"><span typeof="mw:Entity">?</span></span>