Automated people movers and transit systems 2013 [electronic resource] : half a century of automated transit -- past, present, and future : proceedings of the Fourteenth International Conference, April 21-24, 2013, Phoenix, Arizona / sponsored by the Transportation & Development Institute (T&DI) of the American Society of Civil Engineers ; edited by William H. Leder, P.E., William J. Sproule, Ph.D, P.E.