the D2 Subway corridor, with the Orange maintaining its current terminals. The Red and Green Lines would continue to operate on the existing transit mall. Additionally, the western segments of the Blue and Green Lines would swap alignments, with the Green Line terminating at UNT Dallas and the Blue Line running to North Carrollton/Frankford. The system would continue to operate at 15-minute peak headways and 20-minute off-peak headways and with the same span of service from approximately 3:30 AM to 1:30 AM. Based on core capacity needs, an additional Red Line service would be added during peak hours from Cedars station to Parker Road station to address crowding. Services would continue to operate with two- or three-car length trains and not require an additional increases in fleet size beyond the current 163 Kinki Sharyo SLRV cars. Trains on the corridor would average , with a maximum speed of between Museum Way station and Metro Center station with 30 second average dwell times. References External links D2 Subway Project Page Rail transportation in Dallas Public transportation in Texas Proposed railway lines in Texas 2028 in rail transport Railway tunnels in the United States Buildings and structures in Dallas