Point of fact: Line 57 used to have an express line from Portland to Forest Grove (line 91 TV Hwy Express), back when the 57 ran from Portland to Forest Grove. When the Blue Line was extended west, the West Side lines were dramatically changed.
57 TV Hwy (Portland - Forest Grove local service) -> 57 TV Hwy (Beaverton - Forest Grove local service)
58 Sunset Express (Portland - Hillsboro via US 26 and Shute Road, rush hour) -> 58 Canyon Rd (Beaverton - Portland local service)
59 Park Way (Portland - Beaverton local service) -> 59 Walker/Park Way (Willow Creek - Sunset TC rush hour service) (functions as 94 Walker Road Express, see below)
62 Murray Blvd (Portland - Washington Square via US 26, Murray, Scholls Ferry) -> 62 Murray Blvd (Sunset TC - Washington Square via Murray, Beaverton TC, Murray, Scholls Ferry)
63 Washington Park - OMSI (Sylvan - Rose Quarter via Canyon Ct, Zoo/Forestry Center, Fairmount Blvd, Salmon, Hawthorne Bridge, OMSI, MLK/Grand Ave, Lloyd Blvd) -> Washington Park (Sylvan - Kings Hill via Canyon Ct, Zoo/Forestry Center, Fairmont, Salmon)
88 SW 198th (Portland - Aloha) -> 88 Hart/198th (Willow Creek - Beaverton)
89 Union Mills (Portland - north of Tanasbourne) -> 89 Tanasbourne (Sunset TC - Tanasbourne)
91 TV Hwy Express (Portland - Forest Grove express service) -> Deleted
94 Walker Road Express (Portland - Tanasbourne via US 26, Canyon, Walker) -> 94 Pacific Hwy Express (Portland - Sherwood via OR 99W); Walker Rd service absorbed by realigned line 59.
95 Tigard/I-5 Express (Portland [Lloyd Center] - Sherwood via I-5, OR 99W) -> Absorbed by 94 Pacific Hwy Express
98 PCC Sylvania Express (Portland - PCC Sylvania contra-flow express via I-5, Capitol Hwy) -> Deleted; absorbed by PCC's all day free bus service
As for line 12 Barbur, it has its dedicated express line, the 94, originally the 95. After the 94 Walker Rd was discontinued, it was paired with the 95, giving the 12 TWO express lines until the 94 absorbed the 95.
Line 33 has line 99 McGlouglin Express as its rush hour express service, plus lines 31 King Rd/Estacada and 32 Oatfield providing rush hour relief local* service between Portland and Milwaukie. *As much 'local' service as you can get on OR 99E north of Milwaukie...
Line 9 Powell is an odd situation. Between OR 99W and SE 39th Ave, it has line 66 Hollywood-Marquam Express. Beyond that, it's on its own, making the 66 more of a express line for line 75 Chavez/Lombard... which used to have two express lines on SE 39th Ave, running in opposite directions (66 Hollywood - Marquam Hill, 74 SE Portland, Rose Quarter - Woodstock).
Line 9 should have a dedicated express line, but not past I-205. However, the express should continue to Gresham, along Division with line 4.