bilevel railcar vs bilevel car

bilevel railcar and bilevel car both are nouns.

Word	Noun	Adjective	Verb	Adverb
bilevel railcar	Yes	No	No	No
bilevel car	Yes	No	No	No

As nouns, bilevel railcar and bilevel car are synonyms defined as:

bilevel railcar and bilevel car: a type of rail car that has two levels of passenger accommodation, as opposed to one, increasing passenger capacity.

Other synonyms of bilevel railcar include bilevel rail car, double-deck carriage, double-deck rail car, double-deck railcar.

bilevel railcar (noun)	bilevel car (noun)
a type of rail car that has two levels of passenger accommodation, as opposed to one, increasing passenger capacity.	a type of rail car that has two levels of passenger accommodation, as opposed to one, increasing passenger capacity.