The Nassau Street Loop, also called the Nassau Loop, was a service pattern of the Brooklyn–Manhattan Transit Corporation (BMT) inaugurated in 1931 when the BMT Nassau Street Line was completed, providing a physical link that allowed a train to originate in Brooklyn, run through lower Manhattan and return to Brooklyn without having to terminate and reverse the direction of the train. Nassau Loop services have not been able to operate since 1967, when the Loop line's connection to the Manhattan Bridge was severed.