A Regional Transportation District light rail train derailed at Exposition Avenue and Sable Boulevard in Aurora on Wednesday afternoon.
Officials said 24 people were treated for injuries – three of them were transported to the hospital.
But while the damage appeared extensive, none of the injuries was life-threatening.
“They all walked off the train,” Aurora Fire Department spokesperson Sherri-Jo Stowell said.
Mike Kopp, a 55-year-old Aurora resident, had feared for the worst and assumed two trains collided, which was not the case.
"I worked in the area, so I walked around all the time," he said. "It appeared as thought het eastbound and westbound trains crashed."
"But I've never seen them cross (the rail)," he added.
Stowell said the incident commander ramped up the number of responders to take care of people. They included multiple ambulances and ladder trucks, a tech rescue team and specialized equipment to stabilize the train and ensure the incident did not cause electrical surges.
Officials estimate that it would take 12 hours to clear the wreckage, which means the intersection will likely remain closed until 6 a.m. Thursday.
Aurora Police said no vehicle was involved in the derailment.
The police first reported the crash on Twitter and reported "multiple injuries."
#APDTrafficAlert: An @RideRTD train has derailed at the intersection of Exposition and Sable. Multiple injuries reported, unknown extent.— Aurora Police Dept (@AuroraPD) September 21, 2022
The entire intersection will be CLOSED for an extended time.
Any updates will be here. @AuroraFireDpt pic.twitter.com/TN7FTsmr7K
"Shuttle buses will be replacing R Line due to the accident," RTD tweeted.
"Trains will run between Lincoln Station to Florida Station and between Peoria Station and 13th Ave. Station while a Bus Bridge is being put into place."
The R Line opened in 2017, and, in 2020, saw over one million riders, a drop from 1.9 million the year before.
This story is developing and will be updated throughout the evening.
STAY INFORMED: Sign-up for the daily OutThere Colorado newsletter here