Found 4!
🚂 Eastbound
Green-D train #3916-3901
stopped at Brookline Village Station - Inbound
🚂 Eastbound
Green-B train #3923-3911
stopped at Harvard Ave - Inbound
🚂 Eastbound
Green-C train #3902-3910
incoming at Copley Station - Inbound
🚂 Eastbound
Green-B train #3907-3906
in transit to Boylston Station - Inbound