 The station 's low @-@ level , concrete platforms are approximately 450 feet ( 137 m ) long covered by steel , " butterfly @-@ style " canopies with wooden roof decking . New York Central made use of four tracks situated on two island platforms ; the Pennsylvania Railroad used two tracks on a single island platform . A network of tunnels beneath the station facilitated the transfer of mail to and from the former Griswold Plaza Post Office nearby . A bomb shelter , still stocked with cases of " U.S. Civil Defense All @-@ Purpose Survival Crackers " from the early 1960s , is next to the station 's boiler room and its three , coal @-@ fed furnaces . 
