The Comet was a diesel-electric streamliner built in 1935 for the New York, New Haven and Hartford Railroad by the Goodyear-Zeppelin Company.

[1] Smaller than the other streamliners, it was a three-car, double-ended train that could operate in both directions and thus did not need to be turned at destinations—ideal for the New Haven's cramped terminus at South Station in Boston.

It was initially placed into service between Boston, Massachusetts and Providence, Rhode Island on a 44-minute schedule; later, intermediate stops were added at Back Bay in Boston and Pawtucket/Central Falls, Rhode Island, on an advertised "44 miles in 44 minutes" schedule.

The whole exterior was covered with a coat of clear varnish to prevent tarnishing.

The front ends were sharply raked, with a pointed "chin" pilot.