Sigh, Yes I mistakenly said "TTC operators" when I meant "TTC operations". Operations including their inspection/maintenance teams too.
There's a big difference between being shown the controls in the cab and puttering back and forth on the track, and the maintenance team being allowed to take all their measuring devices through it. TTC did have full access at one point, then the contractor asked for them to be removed because they kept bringing up issues where TTC spec wasn't met, like rails being out of alignment by a few mm, but the Crosslinx tender wasn't that specific. Crosslinx was legally in the right to demand TTC removal and I've not seen anything from Metrolinx or Crosslinx about the issues TTC staff were bringing up. Were they resolved? Was it decided the contract didn't require it so they're still issues? Will there be work after Crosslinx releases the project to Metrolinx?
Crosslinx is responsible for maintenance but AFAIK they don't pay for bus substitution service when Eglinton Line needs repairs.