The market clearing wage only applies in economic textbooks, in a perfectly competitive market with balanced supply and demand. The US public transportation sector has major supply/demand imbalances and is a regulated market.
It's not exactly apples to apples because the bls figure is nationwide and doesn't include healthcare benefits, and king county metro may have better than average healthcare, but at least ballparking this: No, public bus drivers are not paid "well above" the median wage
Edit: I found this listing on indeed for greyhound bus drivers (the closest comparison I could think of in the private sector) and starting rate is $28-$31 in Seattle (https://www.indeed.com/m/viewjob?jk=2516c81006044ec8).
i think main thrust, you are right that the numbers are less extreme than i had recalled. SF (which i imagine is the top end) is $31-$47 range or so. i see lower ($25) for greyhound than you do, but frankly that seems unreasonably low so i think “salary.com” is not giving me solid numbers there.
Indeed shows an active listing in SF for Greyhound for the same amount as Seattle. Greyhound appears to have a single national salary scrolling through different cities. https://www.indeed.com/m/viewjob?jk=ad2e68b167688669
Also the median weekly wage in the US is currently $1196 a week (https://www.bls.gov/news.release/pdf/wkyeng.pdf)
Seattle is currently paying bus drivers $31.39 an hour, 40x = $1256 (https://kingcounty.gov/en/dept/metro/about/careers/drive-for...). And I'm sure the pay is less in less affluent/dense US cities.
It's not exactly apples to apples because the bls figure is nationwide and doesn't include healthcare benefits, and king county metro may have better than average healthcare, but at least ballparking this: No, public bus drivers are not paid "well above" the median wage
Edit: I found this listing on indeed for greyhound bus drivers (the closest comparison I could think of in the private sector) and starting rate is $28-$31 in Seattle (https://www.indeed.com/m/viewjob?jk=2516c81006044ec8).