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dont the new york ones look extremely similar to the one form chicago or something that is in one of the dlc's?
 
I don't think there is any real consistency in vehicle capacities anymore. The standard game and the first three DLCs, yes. But after that, not so much. The Tatra T600 in Player's Choice is only one car long yet has the same capacity (30) as the City T13 and the Railcad Volatio. The even smaller Modern Cable Car in US Cities has a capacity of 32!
 
You forgot about Toyoka Juutai (24), EvoUrban (26), City Trolley (25), Toyoka Ogon F-46 (27), all of this four vehicles are only single deckers.

It's as if the devs decided that the original scale for vehicle capacities was too small, so the new vehicles have a larger capacity scale, but they didn't update the old vehicle capacities.