That must have changed when they went from Superliner cars to single level cars, as when I rode it back in 2000 I was in the only sleeper and it was 5001.You're wrong about this one. The Cardinal only has 1 sleeper, and last October I had car 5000, and next month I have car 5000!The series is the last two digits of the car number on your ticket. Where I'm certain, I've also indicated if the lowest number is a 0 or a 1.
50/51 - Cardinal - 00's, lowest is 01
I'll update my list with your new info.