It is also the northern terminus of WES Commuter Rail and a hub for bus routes mostly serving the westside communities of the Portland metropolitan area.

The first Beaverton Transit Center opened at a different location from the current facility, about 1,100 feet (340 m) farther south on Lombard Avenue and Broadway Street near Beaverton–Hillsdale Highway;[4][5] there were timed transfer connections among the several bus routes that served it.

[7] A new plan surfaced that same year amid discussions of building a busway or light rail line between Portland and the west side.

[9] TriMet studied three site proposals, which included an expansion of the existing location on Lombard Avenue and Broadway Street, a triangular area occupied by existing establishments between Hall Boulevard and Watson Avenue, and 4.8 acres (1.9 ha) of undeveloped land on Canyon Road and Hall Boulevard.

[10][11] TriMet had targeted beginning construction of the replacement facility by the summer of 1987, but the discovery of an illegal land fill at the site, which revealed that the property had originally been a wetland, prevented the issuance of a U.S. Army Corps of Engineers (USACE) permit.

Preliminary work finally started in October of that year after the USACE deemed that "public interest" outweighed the environmental losses caused by the land fill and issued the permit.

[12][13][14] Urban Mass Transportation Administration funds covered 80 percent of the project's $2 million budget, and the second Beaverton Transit Center opened on September 4, 1988.

[15] It was initially built as another bus-only transit center, but plans reserved an area on the north side of the property for future light rail platforms.

[19] Between 1998 and 2001, TriMet operated only one MAX service, which ran the entire length of existing tracks from Hillsboro through downtown Portland to Gresham.

[21] Originally, westbound Red Line trains only ran up to the Library and Galleria stations in downtown Portland, where they turned around at the 11th Avenue loop tracks.

[23] The committee studying the rail plan examined two options for the line's northern terminus: Beaverton Transit Center and Merlo Road/Southwest 158th Avenue station.

[25] After several years of delays due to a lack of funding,[26] a platform for the WES Commuter Rail line began construction at the southern end of the transit center in 2006.

[29] The Beaverton Transit Center bike and ride opened the following July with 100 spaces for bicycles, at the time the largest in the TriMet system and the Pacific Northwest.

The WES platform occupies the southeastern edge of the transit center, accompanied by a single-track railway and a buffer stop to mark the end of the line.

[2] MAX trains serve the transit center for approximately 22 hours from Monday to Thursday; they run slightly later on Fridays and Saturdays and end earlier on Sundays.

[45] A majority of the bus routes stopping at Beaverton Transit Center serve the westside communities of Washington County and downtown Portland.