Plot the relationship between cruising speed and station vehicle flow for a system with the following characteristics for safety regime a: L = 20ft/veh, N=1 veh/train, xo = 3ft, 8 = 1s, dn-8ft/s, de-24ft/s. Assume a dwelling time of 10s. Calculate and discuss the station capacity that would result from varying the number of vehicles per train from N=2 to N=5.