Yes, DART uses Kinkisharyo light rail vehicles (LRV).
http://www.kinkisharyo-usa.com/
Instead of buying many more vehicles for the Green line, DART is extending all 115 LRVs they have now into SLRVs.
LRV arriving at Park Lane station
SLRV near Park Lane station
Two SLRVs hold almost as many passengers as three LRVs.
LRV = 76 seated, 160 total.
SLRV = 100 seated, 200 total.
Some math:
LRV= 2 x 76 = 152, 2 x 160 = 320, 3 x 76 = 228, 3 x 160 = 480
SLRV = 2 x 100 = 200, 2 x 200 = 400, 3 x 100 = 300, 3 x 200 = 600
Adding a "C" section to a LRV is common overseas, DART will be the first to do so in America.