Outbound and inbound timetables for Tsurukawa Station, Odakyu Line, September 2014
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Now check out inbound frequencies: once again, 6 trains per hour is maintained all day, whether weekends or weekdays
Once again, we find slight reductions for early morning and late night, and we find extra frequency during rush hours.
Before continuing, let me clarify that Tsurukawa is a minor station on the line; more important stops have double this frequency
With that out of the way: what lessons can we draw from this for Boston? First, that all-day ridership is the market, not just commuters...
...and second, that to serve this market, you maintain a basic frequency for most hours of service for every day of the year.
For crowded times of day, you might add extra frequency--but the difference won't be drastic (6 -> 7 per hour vs 1 -> 4 per hour)
Why wouldn't you need to double the frequency during rush hour? Because your baseline frequency allows considerable excess capacity!
This way, for most of your hours of operation, the train will be comfortably empty--plenty of seats relative to the number of riders
During rush hour, *existing capacity fills first* before you have to worry about running extra trains...
...and when you DO need to add extra trains, you won't need to add that many.
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