Commuters may notice more crowded trains Thursday morning.
Metro pulled 100 rail cars from the tracks Wednesday for safety inspections after video captured by riders showed train doors open while trains moved through tunnels.
All older, 4000-series trains were pulled, so fewer eight-car trains will be used on the Red, Blue, Orange and Green lines. Commuters can expect to see more six-car trains at least until next week.
Eventually, the troubled 4000-series trains will be phased out for the newer 7000-series trains, which have already started to roll in the system.
Presuming no larger problems are found, all trains are expected to be back on the tracks Monday.
"I feel like for safety reasons, I guess it's a good thing," one rider said.