Is using a chain lock to lock up luggage on Swiss trains totally unnecessary?

Swiss trains are like others, there are places to store large bags at the ends of the cars, often a center luggage rack, (also space between seats that are back-to-back) and overhead racks for smaller items. I've never had a problem, but if it gives you peace of mind, go ahead and lock them up.

No one has ever attempted to steal my luggage aboard any train ever. The only thing I can say is that most likely your baggage will be safe without the chain, and with the chain it will definitely be there when you're ready to exit.

Especially in Switzerland, I wouldn't bother locking luggage to the rack with a chain or cable as the trains there are quite safe (but of course no guarantees). When travelling by train with non-reserved seats, I try to choose seating that allows me to see the luggage rack, and it may also be possible to keep larger items with you at the seat, especially if the train is lightly loaded or you're in a compartment. My Daypack always stays with me, even if I have to visit the WC (one of the disadvantages of travelling solo).

I should mention that I have seen luggage pinched on trains in Germany and Austria, but I suspect that doesn't happen often. In one case that I can recall, a young couple from the orient had placed a large wheeled item in the "V" between seat backs and then went to the dining car for a meal. When they returned, the bag was gone! Police from Austria boarded on the next stop and they were followed by Police from Germany. They scoured the train from one end to the other (several times), but the bag was never found (at least not that I saw). I was sitting in that car, but wasn't paying attention and didn't notice the bag being taken.

If chaining your bags helps you relax a bit more on the journey and not constantly looking over your shoulder at each stop...go for it! One less thing to worry about;)

A cable weighs next to nothing and a small lock as a deterrent won't add much either. Might as well do it, just for the peace of mind. I do.

This is very impressive!

Police from Austria boarded on the next stop and they were followed by Police from Germany. They scoured the train from one end to the other (several times), but the bag was never found

@phred,

That's what I observed. When the train crossed the border, I'm assuming one of the police agencies had to leave as they no longer had jurisdiction?

Thank you all for your thoughts. Sounds like it's mostly a peace of mind thing, at least for Switzerland...