With a sanctioned monopoly over streetcar service in the two cities , the O&CB was among the earliest major electric street railway systems in the nation .
Was one of the last streetcar operators in the U.S. , making O&CB 's last run in 1955 .
With a sanctioned monopoly over streetcar service in the two cities , the O&CB was among the earliest major electric street railway systems in the nation , and was one of the last streetcar operators in the U.S. , making its last run in 1955 .