The train crashed into the back of the trailer in Montebello at about 6 a.m. Tuesday, pushing the trailer containing frozen food against the corner of a business.
There was no derailment and no one was hurt.
KNBC-TV (http://bit.ly/RAkz1u) says Metrolink trains were unable to stop at the Montebello station and buses were shuttling passengers to destinations.
Crews moved the trailer about two hours after the collision and Metrolink trains were running at 8:10 a.m.
Information from: KNBC-TV, http://www.nbc4.tv/