rrrr
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Filter out transfers that let you wait for x hours.
In the night where service is sparse, it's kind of pointless to show a trip that takes you somewhere, then let's you wait for 6 hours and then takes the first train at 6am.
Consider the case where the only way to reach the destination contains a 6 hour wait, but does reach the destination at 10PM. We then reverse that itinerary twice and give you a nice compact journey that happens to arrive at 10PM because it is the only one in the day. The long wait is a necessary flaw in the first pass to discover that there is only one option later in the day.
Graphic illustration of issue: http://i.imgur.com/vzi2pjZ.png