Found 6!
🚂 Eastbound
Green-D train #3902-3905
stopped at Riverside Station - Inbound
🚂 Eastbound
Green-D train #3911-3915
stopped at Hynes Station - Inbound
🚂 Eastbound
Green-C train #3900-3904
incoming at Saint Mary St - Inbound
🚂 Eastbound
Green-D train #3914-3919
stopped at Haymarket - Green Line Outbound
🚂 Westbound
Green-B train #3922-3918
stopped at Sutherland Rd - Outbound
🚂 Eastbound
Green-D train #3913-3923
in transit to Brookline Hills Station - Inbound