Originally Posted by
aadivasi
1) I go to philly, park my car, get on amtrak and have it scanned by conductor and get off in trenton. Does this count as train trip? Then go home and in the morn take the car. For return exclude the train leg and just drive back in the car.
This should work, provided the conductor scans your ticket before you get off at Trenton. Should be no problem.
2) go to philly and take train all the way to Newark international stato on but not take monorail and stay in the hotel overnight.
This should work too, but the only way to not take the monorail is to take another Amtrak or NJ Transit train out of the same station.
3) skip the train leg and go to the airport directly.
You answered this yourself:
If I don't take the train then I am breaking the trip and the tickets will be cancelled
4) just get the tickets from kiosk and not have conductor scan it.
Your flight segments will be cancelled. You have a chance of getting them reinstated by pleading with an airport agent and show your "proof" that you took the train (your train ticket and hotel bill for the overnight) but there is no guarantee that you will succeed. Depends on agent and whether there are seats left on the flights. At the very least you will lose your seat assignments, and probably end up in a middle seat to SFO.
5) Any possibility to call united to remove train segment from the trip.
Only if there is a serious Amtrak irop.
6) if I were to do first leg as required and don't finish the second leg train journey, any issues with united?
This is called throw-away ticketing and prohibited by the CoC. However, there is no history reported here of UA ever taking action against a pax for this infraction. An occasional throw-away is probably okay, but I would not make a habit of it. An immediate consequence is that you would not earn miles (RDM and PQD) for the train segment.