The truck hit a wall near Sayre Avenue on the inbound Kennedy about 7:20 a.m., causing items to fall off the truck, state police said.
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No one was injured.
The CTA said Blue Line trains were suspended between Jefferson Park and Rosemont due to debris on the tracks just before 8 a.m.
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Trains began moving again with residual delays just before 8:45 a.m.
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Chopper 7 was over the scene, and emergency crews appeared to be blocking all but one lane of the inbound Kennedy, as they gathered around a large item that was close to the CTA tracks.
Traffic began moving again just before 8:15 a.m.
No one was injured on the train, CFD said.