Montgomery County’s Ride On buses will operate on a reduced scheduled Thursday and Friday, the county announced, after pulling 27 buses from the fleet because of safety concerns.

Isiah Leggett, the county executive, ordered service suspended for buses using components from Thor Industries’ Champion Bus and Navistar companies, after an out-of-service Ride On bus caught fire in Silver Spring on Wednesday.

It was the seventh Ride On bus fire in three years. Previous incidents prompted a federal safety investigation and a grievance from the union representing the bus drivers.

The county is replacing the buses, but expects that will take till the end of August.

The scheduled for Thursday and Friday puts the bus system on what the county calls a modified holiday schedule. Use this link to see the schedule on the county’s Web site (

Service will be about 80 percent of what is normal for a weekday. But all routes will have service and some are unaffected, the county said.

There are three additions to the posted schedule: Route 2 will provide service to Walter Reed; Route 38 will provide service to the U.S. Postal Training Academy and Route 54 will provide service to NIST (National Institute of Standards and Technology).

Ride On expects to operate its normal Saturday and Sunday schedule this weekend, but has not yet issued service information for next week.