The key routes designated in 2004-05 (routes 1, 15, 22, 23, 28, 32, 39, 57, 66, 71, 73, 77, 111, 116, 117) are largely replaced in MBTA publications with the frequent routes. Some questions about them (and BNRD):
Which two routes were created during the MBTA era? Which of them was on a routing...