Some people have personalities that help them create excellently researched, extremely detailed articles. Train spotters, bus spotters, etc, will have articles with a wealth of detail, all of which can be traced back to authoritative real world documentation.

(http://en.wikipedia.org/wiki/List_of_bus_routes_in_Essex)

(http://en.wikipedia.org/wiki/List_of_bus_routes_in_London)

(http://en.wikipedia.org/wiki/London_Buses_route_9)

(The London article has some fascinating facts.)

But these articles have been the target of deletionists.

People, perhaps rightly, get confused that you can have a list of fictional ducks (http://en.wikipedia.org/wiki/List_of_fictional_ducks) but not lists of Olympic athletes.