You get the AGR points but you can get a voucher for the ticket amount. I had this happen once (I made a last-minute switch between two trains scheduled to leave WAS within 10 min. of one another on a proverbial "bad feeling" about the Regional getting held up south of WAS...it panned out and I had a relaxed dinner on my way into Richmond). I got a voucher for the Regional in spite of the force-lift.