To varying degree. The test track is only for the telemetry logging where you're picking off faults that would appear anywhere after enough duty cycles of operation. And those tend to be weighted heaviest to pilot cars and early deliveries where the fixes result in actual change requests to the manufacturer techs. i.e. The test track is going to weight early and 'obvious' at the faults it logs. It's largely agnostic to application, so for example this is why the Blue Line 0700's started their Boston careers on the OL Wellington test track for several months before ever being shipped to Orient Heights (Blue of course not having any test track of its own).They'll need to prove all of the new trains as they come in, yes? Not just the first set?
"Dual modes": the universal solvent.Maybe somebody could drop a hint to the Globe reporters that there might be FRA compliant gondolas that could use Track 61, but "fly" over Cabot, Southampton and Widett.