The MBTA announced that it will maintain frequent, rush-hour levels of service on all subway lines beginning at approximately 9 a.m. on Tuesday, Feb. 7, to accommodate parade goers to the downtown area for the Patriots’ Super Bowl parade.

The T said customers are encouraged to purchase round-trip fare in advance to avoid long lines. Ticket checks and boarding queues will be in place throughout the afternoon and evening.

Parade goers intending to travel on the commuter rail are asked to board…