Metro has temporarily removed all 4000-series railcars from service after recent problems with doors.
Last week, FOX 5 shared video of a door that was wide open on a moving Red Line train. There have been similar incidents reported to the transit agency lately.
The railcars will be inspected through the weekend. If no systemic safety issue is identified, Metro said it plans to place the cars back in service next week. Metro said the move is out of an abundance of caution.
Riders may notice fewer eight-car trains on the Red, Blue, Orange and Green lines during rush hour for the rest of the week.
Metro says the 4000-series is the transit agency's smallest fleet with 100 cars. They are the least reliable and will be replaced by 7000-series cars in the coming years.