no way would anyone in h/her right mind choose to live in Downtown Dallas and work in Downtown FTW UNLESS they were willing to use the train to go back and forth--
not sure what the schedule is--but there is station by AA/Reunion Arena that winds up just south of Sundance Sq--would probably mean taking a city bus to final destination...
and you can get bus from other areas in Dallas to the AA/Reunion station--not sure how much time would be involved--it is probably a 40 min trip because of the stops along the way
check out this link
Trinity Railway Express (TRE)
checking that link--the AA station is only workable during concerts there--so you would have to choose the Union Station I guess and looks like it is about an hour's trip because of distance/stops--but reports in FTW paper say it is a decent train--clean--few problems en route
Driving from Irving into downtown FTW would be against traffic but you have to go through the Grapevine interchange--messy and going to get worse IF they start on redoing 114/121 interchange as they have promised--114 /121/183 or the George Bush turnpike to 183 really only viable ways
would think it would be at least 45 min each way and longer in afternoon...
plus parking charges--no free parking in downtown during working time...