The MTA projects more Metro users could use the commuter rail service as Metro's SafeTrack program moves forward.
The driver was taken to an area hospital with non-life-threatening injuries.
Authorities said crews are resolving the issue.
Trains are operating at restricted speeds, police said.
After two days of service disruptions, the MARC Brunswick Line operates on a regular schedule Wednesday, the Maryland Transit Administration said.
MTA says it's an effort to improve safety and security.
Commuter rail services of Amtrak, VRE and MARC resumes, delays remain into and out of D.C.
The Maryland department of transportation has agreed with a plan to keep the Laurel train stop and add a new full service stop less than half a mile north, in Howard County. But CSX hasn't agreed to the change.
You'll have a few more transit options than Monday, but if you travel by transit on Tuesday make sure if you have a good commuting plan because bus and rail operations in the region are not yet normal.
Riders can take Metro instead.