"RTD - B Line". Regional Transportation District. Retrieved June 22, 2015.
"Peak Service Study"(PDF). www.rtd-denver.com. Retrieved 2023-07-10. RTD is evaluating an initial peak service approach as a first steptoward full day rail service to Boulder and Longmont
Regional Transport District. "Northwest Corridor FAQ". Regional Transport District. Archived from the original on 10 February 2020. Retrieved 22 April 2013.
Regional Transport District. "Northwest Corridor FAQ". Regional Transport District. Archived from the original on 10 February 2020. Retrieved 22 April 2013.