Q353 Service completed by anyone?

I am still struggling with Q353, always getting stuck at a Stop aspect near Cooks Mills MP187, two signals away from the Slip Rock crossovers.
Service Q217 is trailing me, and stopped one block behind.
Timetable objective seems a bit ambitious for the single GP38-2 that powers Q353, toting 35 cars: lv Cumberland 08:33 arr Hyndman 09:01 (28 mins running).
Trailing Q217 is powered by two big GE motors: lv Cumberland 08:44 arr Hyndman 09:09 (25 mins running)
As far as I can see trains do not overtake each other on the fly, nor are there passing sidings to arrange meets.
What am I doing wrong? I gave the GP38 the spurs this time, but still obeyed the speed limits (mostly, not getting into the red overspeed).
I just couldn't go much faster and was running on Approach indication for several blocks, even though there seemed to be no train ahead of me.
After waiting for an hour or so, I got off the locomotive and relinquished the train. The signal stayed red, the AI crew didn't overrun it, and fps suddenly was in the green with the train in full view!
I tried to sit in the conductors seat, hoping for a ride along, but alas, that didn't happen.
When I boarded the locomotive and took control however, fps dropped into the yellow again. Strangest thing, ESC didn't bring up the menu to end the scenario, I was stuck!
Service Q217 is trailing me, and stopped one block behind.
Timetable objective seems a bit ambitious for the single GP38-2 that powers Q353, toting 35 cars: lv Cumberland 08:33 arr Hyndman 09:01 (28 mins running).
Trailing Q217 is powered by two big GE motors: lv Cumberland 08:44 arr Hyndman 09:09 (25 mins running)
As far as I can see trains do not overtake each other on the fly, nor are there passing sidings to arrange meets.
What am I doing wrong? I gave the GP38 the spurs this time, but still obeyed the speed limits (mostly, not getting into the red overspeed).
I just couldn't go much faster and was running on Approach indication for several blocks, even though there seemed to be no train ahead of me.

After waiting for an hour or so, I got off the locomotive and relinquished the train. The signal stayed red, the AI crew didn't overrun it, and fps suddenly was in the green with the train in full view!
I tried to sit in the conductors seat, hoping for a ride along, but alas, that didn't happen.
When I boarded the locomotive and took control however, fps dropped into the yellow again. Strangest thing, ESC didn't bring up the menu to end the scenario, I was stuck!