What is "shoreliner"

Shoreliners are a class of locomotive-hauled rail car used by the Metro-North Railroad for service on non-electrified portions of their system. They are similar to Comet-class coaches used by New Jersey Transit, however there are several differences between the two. Ownership of the fleet is split between the Metropolitan Transportation Authority and the Connecticut Department of Transportation, as part of the latter's operating agreement with MTA. MTA coaches have blue window bands, while CDOT coaches have red ones.