The A-Train is a train that runs from Denton to Carrollton and includes an interface with DART's Green Line.  It started running on June 18, 2011, starting with a week of free rides.

The most exciting thing about the A-Train for party people is that it is a means by which to reach Dallas.   Unfortunately it doesn't run late enough to go and get drunk, usually.  At least, not if you plan on returning home before morning.

See also