at 2 round trips a week that would be 400 points per week

Earn 2 points for every dollar spent on Amtrak travel—a 100-point minimum on each trip, no matter the price so in 10 months +- 17,000 points without any promotions.
If you sign up for AGR before Jan 1 2012 and travel within 90 days you will be eligible for 750 bonus points

Once you earn 5,000 points you will become select and receive the following

A 25% point bonus on every Amtrak trip you take, excluding bonus points.

when you make 10000 points you will receive select plus status and receive

# A 50% point bonus on every Amtrak trip, excluding bonus points
# Unlimited access to all ClubAcelaŽ, Amtrak's Metropolitan LoungeŽ, and First class lounges for immediate family members traveling with you or one non-family guest


So your potential without any special promotions is more like 20,000 points +-

In addition if you get the Chase Amtrak CC that is 6,000 to 12,000 points more plus 2 points per dollar spent on Amtrak
that is the potential for another 10,000 to 18000 points more