Taking the train to avoid riding up the cage? The ride back into Sac is the easy part of the ride, you wuss.
OKOK, in fairness, I'm assuming you're taking the train to shorten the overall trip? There are many places to get on the trail, they're just not all obvious.
Also, the 100s in the summer are fantastic- just jump in the river partway through the ride. You'll be dry by the time you get home.