Re: "security" with regards to the Sleeper Rooms and Roomette.

There is no lock on those doors that can be secured from the outside of the cabin. There is a small latch system which requires someone on the inside to set (or undo) the lock. This is similar to a bathroom stall lock, where it is locked only while you are inside.

Generally, people don't go in other people's sleepers as a matter of ettiquette. If you're concerned, then when visiting the diner/lounge/sightseeing cars, keep any valuable personal belongs on your person. That said, I've never had an issue leaving items in bags in the roomette, but I don't leave hundred dollar bills out on the seat either.