'First-class car' definitions:

Definition of 'First-class car'

From: GCIDE

First-class \First"-class`\, a. Of the best class; of the highest rank; in the first division; of the best quality; first-rate; as, a first-class telescope. [1913 Webster]
First-class car or First-class railway carriage, any passenger car of the highest regular class, and intended for passengers who pay the highest regular rate; -- distinguished from a second-class car. [1913 Webster]