A Regional Transportation District light rail train derailed on Exposition Avenue and Sable Boulevard in Aurora on Wednesday afternoon.
Officials said 24 people were treated for injuries – three of them were taken to hospital.
But while the damage appeared extensive, none of the injuries were life-threatening.
“They all got off the train,” said Aurora Fire Department spokeswoman Sherri-Jo Stowell.
Mike Kopp, a 55-year-old Aurora resident, had feared the worst and assumed two trains had collided, which was not the case.
“I work in the area so I walk around all the time,” he said. “It looked like the eastbound and westbound trains had crashed.”
“But I never saw them cross (the rail),” he added.
Stowell said the incident commander increased the number of responders to take care of people. They included several ambulances and ladder trucks, a technical rescue team and specialist equipment to stabilize the train and ensure the incident did not cause electrical surges.
Officials estimate it would take 12 hours to clean up the wreckage, meaning the intersection will likely remain closed until 6 a.m. Thursday.
Aurora police said no vehicles were involved in the derailment.
Police first reported the accident on Twitter and said they were “multiple injuries”.
The entire intersection will be CLOSED for an extended period.
— Aurora Police Department (@AuroraPD) September 21, 2022
“Shuttle buses will replace line R due to the accident,” RTD tweeted.
“Trains will run between Lincoln Station and Florida Station and between Peoria Station and 13th Avenue Station while a bus bridge is in place.”
The R Line opened in 2017 and in 2020 welcomed over one million passengers, up from 1.9 million the previous year.
This story is developing and will be updated throughout the evening and Thursday morning.