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The rate varies by location, the department said; for trips within Seattle, drivers will earn 66 cents per passenger minute and $1.55 per passenger mile, or $5.81 a trip, whichever is greater.

For trips outside of Seattle, drivers will earn 38 cents per passenger minute and $1.31 per passenger mile, or $3.37 a trip, whichever is greater.

Despite news of recent derailments, rail is safer than cars, per passenger mile traveled.

Buses, which generally run at about 25 percent capacity, emit 0.64 pound of CO2 per passenger mile, according to data from the Department of Defense.

If they ran full, buses would emit 0.18 pound of CO2 per passenger mile, making them comparable to rail but at a much lower cost.