If you are going first class, say on the Silver, then Raleigh would be a better station. It has the checked baggage and special waiting lounge for sleepers.
Cary is an unstaffed station. If you are stuck there and need to go to Raleigh, here are some options:
Transit Connections: C-tran, 919-481-2020, Triangle Transit Authority, 919-549-9999
Taxis: NC Taxi Limo & Shuttle Service-481-2888 or toll free 877-462-8294.
Union Cab Company-919-481-9646.
Triangle Yellow Cab (call one hour ahead) 919-832-5811
Carry-on Baggage Guidelines:
Passengers may carry only two (2) pieces of baggage on board trains, not including purses, laptops, strollers, etc. Bags may not weigh more than 50 lbs. each and may not exceed a size of 28 x 22 x 14 inches. Passengers must be able to safely carry their own baggage. NOTE: All carry-on bags must have tags with the passenger's name, address and phone number.
Good luck on your trip.