Heck the entire HISTORY of TT is that it is "down" many, many, MANY times.
It was about 2 YEARS LATE opening for the first time.
The vehicles are so high-tech (and "touchy") that they just can't seem to get them to "all run at once".
Its almost a standard joke for many WDW vets to say, "Wow, don't know what's going on at Test Track... It was OPEN nearly all day today."
BTW, the same kind of motor and drive-system used at TT, was used at
Disneyland in the amazing attraction called "Rocket Rods"...
Never HEARD of it? Not surprising...
it was broken down so MUCH that they simply closed and REMOVED the entire attraction about a year or so after its much-ballyhooed (and EXPENSIVE) creation and premiere!
We were lucky enough to actually ride that "E-Ticket" attraction before they finally "pulled" it.
It was FANTASTIC!
Look HERE:
http://www.yesterland.com/rocketrods.html
It took place (at high -speed) on the (former) "People-Mover" tracks that circled Tomorrowland, high above the guests walking below (they call the "People-Mover" the "Tomorrowland Transit Authority" now at WDW's MK) ...
GREAT -when the Rocket Rods where actually MOVING-.
But once they STOPPED due to malfunction (which was quite frequently) there was NO EXIT path for guests out on those narrow tracks.
They had to SIT and WAIT (sometimes for an hour. or so!!!) until the CM's could "limp" the cars back to unload.
At least at Epcot, when Test Track "stops" (and it does so frequently), the guests can "walk away" if need be.
So sad that Rocket Rods could not "perform" at DLR. Otherwise, I'm sure we would have had these amazing Rods at WDW's MK now, instead of the TTA.