previous_type: The type of route the proceeds the current one in the system. See this page for a list.
previous_route: The number of the route preceding this one.
previous_dab: Any disambiguation needed to generate the correct link to the previous route.
route: The route associated with the current browse row. Typically used only if the browsing route is not the route that the rest of the infobox is about.
next_type: Same as "previous_type" but for the route following this one.
next_route: The number of the route succeeding this one.
next_dab: Same as "previous_dab" but for the route following this one.
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