Found 7!
🚂 Westbound
Green-D train #3906-3923
incoming at North Station - Green Line Inbound
🚂 Westbound
Green-D train #3915-3920
incoming at Beaconsfield Station - Outbound
🚂 Westbound
Green-D train #3911-3902
stopped at Government Center Station - Green Line Westbound
🚂 Eastbound
Green-B train #3910-3905
stopped at Sutherland Rd - Inbound
🚂 Westbound
Green-B train #3913-3904
stopped at Copley Station - Outbound
🚂 Eastbound
Green-B train #3916
stopped at Packards Corner - Inbound
🚂 Eastbound
Green-B train #3914
stopped at Packards Corner - Inbound