Modelling Reachability in Transport Networks: Using Alternative Visual Representations in Interactive Linked‐Views to Gain Valuable Insights

Table 1

List of user questions.

	User Questions
UQ1	How long does it take to reach station X with the first train departing after time T?
	Example: How long does it take to reach Ommen with the first train departing after 06:00 AM?
UQ2	Which stations are reachable with the train departing at time T?
	Example: Which stations are reachable with the train departing at 06:04 AM?
UQ3	Which stations can be reached within X minutes with the train departing at time T?
	Example: List all stations reachable within 60 minutes with the train departing at 06:04 AM.
UQ4	When does it take the least or the most time to reach station X during time interval T1-T2?
	Example: When does it take the least or the most time to reach Ommen between 06:00 AM and 07:00 AM?
UQ5	Given a time budget of X minutes, which stations can be reached with the first train departing after time T?
	Example: Robert is in Enschede to attend a 3-day workshop at the University of Twente in the Netherlands. The workshop runs from 09:00 AM to 05:00 PM daily. As he has never been in the Netherlands before, on one of the workshop days he wants to visit another place that is close to Enschede. He can only spare 40 minutes (single trip time only, excluding sightseeing) to travel and wants to know which cities are reachable by train from Enschede within his time budget.
UQ6	How does the reachability of station X change during the day?
	Example: How does the travel time to Almelo de Riet change over time?
UQ7	Which station(s) or network segment(s) is/are heavily-served (receive more trains) or under-served (receive less trains)?
	Example: Which segment of the network is heavily-served: segment A or segment B?
UQ8	Why does it take less time to reach station X than station Y, despite X being farther away than Y in geography?
	Example: Why does travelling by train from Enschede to Deventer Colmschate take longer than travelling from Enschede to Deventer (62 minutes versus 43 minutes), even though Deventer Colmschate is closer to Enschede than Deventer (46 kilometers versus 50 kilometers)?