When can I get any discounts for senior and military?

Yes

I believe that they are good on any trip. I checked the website and Google says 10% for seniors 55 and up. Military gets 20%. I would recommend call them to double check. I recently road the train over Labor day weekend. It was great.

Just call them, they will gladly help you. Semper fi

My Wife need to try this trip one of these days since we're Senior Citizens anyway.