Quote:
Originally Posted by xd_1771
Whether that'll result in enough surplus of Mark I cars such that all of them become 6-car trains is left to be said, however.
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There won't be enough. In fact, there may be even less Mark Is running with 4-car trains.
Just some quick calculations -
Assume dwell + turn-around time is 3min at each end
Expo (King George) - travel time 39min, round-trip 84min, 2.7min headway = 32 trains (same as now)
Expo (Production) - travel time 40min, round-trip 86min, 5.4min headway = 16 trains
Expo (Broadway) - Assume 4 trains (I remember reading this somewhere)
Millennium - travel time 35min, round-trip 76min, 3.0min headway = 26 trains
The trains we have now:
Mark I = 150 cars, with 10% spare = 136 cars
Mark II = 108 cars, with 6% spare = 102 cars
Mark III = 28 cars, assume no spare and share spare pool with the Mark II
Assign trains to the Millennium Line
26x 2-cars MkII = 54 MkII
Assign trains to the Expo short-turn
4x 2-cars MkII = 8 MkII
What we have left for the 48 trains required for Expo:
138x MkI, 40x MkII, 28x MkIII
Assign MkII and IIIs:
10x 4-cars MkII = 40 MkII
7x 4-cars MkIII = 28 MkIII
This makes 17 trains, so the 136 MkI must make 31 trains, so this would gives
6x 6-cars MkI = 36 MkI
25x 4-cars MkI = 100 MkI
About the same amount of 6-car trains as now. However, this is with a very generous spare ratio. The fleet strategy state that the plan is to increase MkI spare to about 12%; the MkII availability would more likely to be 98 instead of 102. In this case, there would be only enough cars to make at most 2 6-cars trains.