If you do that you can only get the Crescent/CL/EB option... If it were me, I'd go all the way to NOL to get the SWC/CS instead!
Just picking a random date (10/30), RVR-NOL was $160 for the rail fare plus the cost of the hotel but RVR-CHI was $83. You can get the SWC/CS choice from CHI (I did it a few months ago
), but not from TOL. It is also $83 RVR-CIN, but that way you get the Cardinal/CZ/CS with an 8 hour layover in SAC. (You do get the best CZ scenery and you don't board the CS until midnight.) However, you could also buy a RSV (Roseville, CA)-EMY-SAC ticket and board the CS at about 10 PM!
(The reason for RSV is that the CZ is discharge only starting in SAC.)
If you did want to redeem a 3 zone award and wanted the SWC and CS, you could redeem a 2 zone award RVR-ABQ and a 1 zone award ABQ-(PDX or SEA)!