While the District of Columbia and Virginia opted to construct CNG fueling facilities at their Metrobus divisions, Maryland opted not to do so. Instead, Maryland financed the purchase of hybrid electric buses. The first of these buses, the New Flyer DE40LF buses, arrived in 2005 and were rehabbed in 2014 and 2015. The DE40LFR buses arrived in 2006 and were rehabbed in 2013.
New Flyer DE40LF 6016 at Wheaton Station, July 15, 2008
New Flyer DE40LF 6017 on Georgia Avenue at Bonifant Street, April 17, 2015
New Flyer DE40LF 6021 on Wayne Avenue at Ramsey Avenue, June 16, 2015
New Flyer DE40LF 6024 on Wayne Avenue at Ramsey Avenue, June 16, 2015
New Flyer DE40LF 6025 on Lockwood Drive at the White Oak Transit Center, July 27, 2017
New Flyer DE40LF 6027 on East-West Highway at 23rd Avenue, June 17, 2009
New Flyer DE40LF 6027 at Silver Spring Transit Center, April 18, 2016
New Flyer DE40LF 6028 at Silver Spring Station, June 8, 2006
New Flyer DE40LF 6028 at Silver Spring Station, June 8, 2006
New Flyer DE40LF 6028 on Campus Drive at Union Lane on the University of Maryland campus, March 9, 2015
New Flyer DE40LF 6035 at Silver Spring Station, March 22, 2007
New Flyer DE40LF 6038 on Colesville Road at 2nd Avenue, June 16, 2015
New Flyer DE40LF 6039 at Friendship Heights, April 14, 2006
New Flyer DE40LFR 6040 at Silver Spring Station, March 22, 2007
New Flyer DE40LFR 6040 at Silver Spring Station, March 22, 2007
New Flyer DE40LFR 6147 on Columbia Road, NW at Biltmore Street, December 24, 2021