ASSIGNMENT #3
1. Assuming that there are two terminals, A and B, and their P-MAKE functions are shown in the below figure. Service headways (intervals) of those terminals are 12 hours and 24 hours, respectively. Draw yard time curves for each terminal.
0 hr 2 hr 4 hr 6 hr 8 hr 10 hr 12 hr 14 hr
1
A
B
AVAIL
f(AVAIL)
(15)
2. Assuming that there is a rail line consisting of two intermediate terminals, B and C. The information of the operation at those terminals are shown in the below figure.
A B C D
12 hours 12 hours 12 hours
AVAIL = 10hrs
f(AVAIL) = 0.7
AVAIL = 10hrs
f(AVAIL) = 0.7
Interval:
24 hours
First compute the expected the current Origin-Destination trip time and then compare with the 4 different improvement plans shown below.
a) Compute the expected O-D trip time with improved in-transit trip time, 10 hour.
b) Compute the expected O-D trip time with improved f(avail) value, 0.9.
c) Compute the expected O-D trip time with improved service headway, 12 hours.
d) Compute the expected O-D trip time with bypassing the terminal B
