UPDATE, 10:10 p.m.: The Globe reports the trapped operator, Terrese Edmonds, has died.
UPDATE, 9 p.m.: One operator still trapped.
Channel 5 reports two Riverside trolleys collided around 6 p.m. near the Woodland stop. Channel 4 has more, says one train was stopped at a red signal. Operator of the second train trapped, eight people seriously injured.
WBZ Radio reported helicopters and ambulances to ferry the more severely injured to hospitals; walking wounded slowly making their way to the train stop.
Staging area set up at Brae Burn Country Club. Initial emergency reports.