Regionalism is dead. It was killed over DART's desire to build both a downtown Dallas D2 line and a suburban Cotton Belt commuter train line. DART
included funding for some preliminary work on a second DART line (D2) line through downtown Dallas in its 2017 budget. It also included funding for some preliminary work on the Cotton Belt.
The latter became the
casus belli for the mass transit war between Dallas and its suburbs to the north.