[1] The L Line's northern terminus is in Five Points northeast of downtown Denver.

[3] The Central Rail Extension Mobility Study Final Report[4] proposed that the D Line stations from 20th & Welton to 30th & Downing and future extension stations be operated on an independent route.

This route would operate from the downtown loop to a new terminus created by sharing the A Line's 38th & Blake station.

[4] RTD's board of directors approved the introduction of the current shorter version of the L Line with the January 14, 2018 service changes.

[6] Beginning on May 26, 2024, the L Line was suspended, as part of Phase 1 of the Downtown Rail Reconstruction Project,[7] which involves rebuilding some of the oldest sections of RTD track.