The V148 discount (20% off regular fares outside NEC and various other routes like BON-POR) is now working at Amtrak.com (it wasn't earlier in the month).

Like previous discounts, this one may be "stacked" with the regular senior discount of 15%, providing what is in effect a 32% discount for seniors.

I have just tried this for ALB-MTR and OKJ-SAC for October travel dates.

See earlier posts for details.