Originally Posted by
RogerD408
I don't think you will have any issues. It appears the AGR system does not really care about miss-matched tickets. I do the SAC RNO run quite a bit and they usually have my return posted as happening before my departure! It turns out they post LD trains as of it's departure from origin and not your boarding. So since the CZ leaves CHI three days before it leaves RNO, my ticket posts as of the CHI date.
I rather suspect that AGR won't care about this trick. However, Amtrak computers might care if they run the housekeeping chore that looks for conflicting reservations. And if they do, then one reservation would end up being cancelled automatically by the computer.