Debra Winger?

Yes. She wasn't in the credits but it was her.

No.

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the only evidence of that being Debra Winger is a trivia item here on imdb. They don't always proofread their trivia submissions very carefully, so take that with a grain of salt. Anyone can submit anything they want, and that's how errant info gets out there. :) The Warriors is not listed on Debra's page, and the woman who looks like her on the train is credited as Jodi Price.

Not her. She was in Urban Cowboy just after The Warriors came out and French Postcards just before The Warriors came out and in both of those she's typical Debra Winger. The chick in the Warriors SLIGHTLY resembles in her left eye and really nothing else. The Warriors chick is heavier too.