(n)bilevel car, double-deck carriage, bilevel railcar, bilevel rail car, double-deck railcar, double-deck rail cara type of rail car that has two levels of passenger accommodation, as opposed to one, increasing passenger capacity.“When double-deck carriages (bilevel cars) were introduced on North American railways (railroads) they identified a problem in that it would be physically difficult - if not impossible - for the conductor to verify, collect payment and sell tickets to such a large concentration of passengers in one car, especially in suburban passenger service, owing to the short distance between stops.”