The Airport Shuttle set features what is apparently supposed to be a logo of the Airport Shuttle monorail system, both on the train itself and prominently on top of the city stop (and possibly in more places). It looks like a capital letter T in front of a circle.
Is there any information available as to what this was meant to signify? I.e. is it meant to symbolize anything about the set (a cross-section of the airport stop?), or is it modeled after a real-world symbol of a comparable transportation system?