The Emerald Express (EmX) is a bus rapid transit (BRT) system in the Eugene-Springfield metropolitan area in Oregon, United States.

LTD chose bus rapid transit after a review process in which several transportation options, including light rail, were considered.

Less than a year later, ridership had doubled in the corridor, and the city of Eugene was nominated for the 2008 Sustainable Transportation Award, and received an honorable mention.

[1] An extension was opened on January 9, 2011, connecting EmX to the Gateway Mall as well as Sacred Heart Medical Center at RiverBend and International Way.

The Institute for Transportation and Development Policy (ITDP), under its BRT Standard, has given the EmX corridor a Bronze ranking.

[3] The EmX system is made up of sections of dedicated bus lanes for most of the route (60%), with normal roads in between.

The articulated buses are equipped with Hybrid drives which allows for a smooth acceleration from stops and through the various road segments.

Unlike other LTD bus routes, the EmX uses a proof-of-payment system, and fares must be paid prior to boarding at ticket vending machines located on station platforms.

The 7.8 mi (12.6 km) Gateway Line extension opened on January 9, 2011, linking downtown Springfield and Sacred Heart Medical Center at RiverBend.