A commuter rail train derailed near Waltham on Tuesday after a wheel came off one of its cars, causing delays at the height of the morning rush and forcing hundreds of passengers to board replacement trains, officials said. No one was injured.
The Fitchburg line’s train 404 derailed around 7:45 a.m. near the Beaver Street crossing between Waltham Station and Waverley Station in Belmont, the MBTA said in a statement.
Around 800 passengers were transferred to another train to finish their trip, the statement said.
At around 3 p.m., the MBTA said in a tweet that normal service had resumed.
“Initial findings from this investigation confirm a wheel separated from a single-level coach car while it was travelling in the inbound direction between Waltham and Waverley stations,” Keolis, the company that runs the commuter rail, said in a statement. “While the root cause of the wheel separation will be determined through this investigation, it has been determined that the wheel separation prompted the derailment.”
According to the release, through the “use of a crane” the train was “re-railed and ... transported to Boston Engine Terminal as part of the investigation to determine the exact cause of this incident. The vehicle in question and all associated components will be quarantined in order to conduct a detailed engineering analysis.”
Commuter rail coach cars, including wheel sets, are inspected every day, officials said.
“As a result of this incident and as a precautionary measure, an inspection of all coaches with the same equipment is now underway and is expected to be complete before the start of the evening commute,” the statement said. “Additionally, the track where this occurred has been inspected to ensure the continued safe passage of trains through this area.”
Keolis said the derailment caused delays on the Fitchburg line throughout the day.
However, the release said, “teams were able to isolate this incident and minimize the impact to service on the remainder of the network.”
MBTA General Manager Luis Manuel Ramírez said in the release that the safety of customers and employees is the agency’s top priority.
“We appreciate our passengers’ patience and cooperation during this incident, and I want to thank our teams for their efforts to restore Commuter Rail to full service,” Ramirez said.
John R. Ellement of the Globe Staff contributed to this report. Jackson Cote can be reached at email@example.com. Follow him on Twitter @Jackson_k_cote. Travis Andersen can be reached firstname.lastname@example.org. Follow him on Twitter @TAGlobe.