http://www.tapsbus.com/301.html
Grayson, eastern Fannin, Clay, western Cooke, Montague and Wise Counties are covered by these little buses. One may ride round-trip, for example, from Henrietta in Clay County to Honey Grove in Fannin for a pretty decent price.
TAPS is a private company, and a real blessing to have available for rural folk ~ beyond the reach of DART and FWTA ... though unfortunately, linkages to those big-city gals are not provided
One fine day, hopefully, the rails will remember us again, but till then ... at least there's TAPS 
