Bus Vehicle & Fleet Facts

TriMet has a total of 660 buses grouped into 18 fleets that represent different sizes, makes and models of vehicle.

We operate 30-foot buses, 40-foot buses and mini-buses. Each bus is assigned to a garage—Center St. Garage or Powell Garage on the Eastside, or Merlo Garage on the Westside. Buses start and end each service day and receive all necessary maintenance at their assigned garage.

Bus fleet stats

TriMet's buses travel over 26 million miles per year. That's like traveling from the Earth to the moon over 100 times! Each year, they use:

  • 5.9 million gallons of diesel fuel
  • 217,696 quarts of oil
  • 91,104 quarts of transmission fluid, and
  • 22,412 quarts of coolant.

Keeping you moving

Photo of maintenance worker

As many as 645 buses may be in service during weekday peak hours.

By federal regulation, the number of spare buses TriMet can keep is limited. This often presents a challenge as nightly maintenance crews try to get enough buses serviced in time for the next morning's pull-outs.

TriMet's Bus Maintenance Department works 24 hours a day, seven days a week.

Each night when a bus returns to the garage it receives the following standard treatment:

  • refueling
  • fluid levels checked
  • interiors swept out
  • exteriors washed (except during freezing weather or when water conservation measures are in effect)

Preventive maintenance

Photo of bus maintenance bay

All buses are subject to a comprehensive preventive maintenance program that includes:

  • inspection of new buses upon arrival
  • basic inspection every 1,500 to 3,000 miles
  • comprehensive inspections at 6,000 miles, 12,000 miles and 24,000 miles
  • engine tune-ups every 50,000 miles
  • transmission service at 36,000 and 72,000 miles
  • wheelchair lifts on buses serviced every 12,000 miles
  • more comprehensive servicing at 48,000 miles
  • wheelchair lifts on mini-buses serviced every 1,500 miles
  • all buses steam-cleaned prior to major inspections

Special procedures for snow and ice

Photo of bus in snow

When snow and ice make it dangerous for cars to be on the road, TriMet swings into gear to help people get around.

Mechanics and maintenance workers spend hours putting chains on bus tires, and hours removing them again when the weather improves. Bus maintenance employees take pride in getting the fleet out on the road at times when riders most depend on TriMet.

TriMet recycles buses and by-products

TriMet buses are retired as new buses arrive and are placed into service. Retired buses are sold through an auction service.

In addition, TriMet reclaims, re-uses or recycles various waste products.

Learn more about recycling efforts at TriMet