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base period Center at Northwestern characteristics common carrier comparison framework containerized cost functions cost surfaces curve daily departures defined described different technologies dimensions example facilities feasible output space fixed network flow capacity freight frequency of departures functional elements graph graph theory high speed rail hour per link included inherently suited intercity intersect level of flow level of service levels of output marginal costs Morlok Northeast Corridor Northwestern University number of terminals object output capabilities output variables parameters planar graphs properties rail and VTOL region of output regional scientist relative resource representation seats per hour service network shown in Figure SIMSCRIPT SPACE OF TECHNOLOGY square mile studies system output space technology classes technology is inherently terminal density trade-offs trans transport system output transport technologies Transportation Center Transportation Engineering transportation service types of transportation U.S. Department urban transportation vector flow vehicle flow vehicle transfers VTOL aircraft