On my last trip to europe, I took TGV from Amsterdam to Paris and back. I recall being warned at just about every stop to "watch my luggage" which was about 20 feet in front of me in the part of the car where people exit from. This was ESPECIALLY warned around Brussels IIRC... So at several points, I got up and stood by my luggage during the stops, which may have been overkill..

Anyways, we will be traveling a lot by rail with luggage in an upcoming trip. 4 passengers each will have a "personal item" backpack and a smaller roll bag (carry on size for airport). Is it correct to assum that for TGV busses in France and the Lyria (?) train in Switzerland will need to have our luggage away from us? In this case, being that the trains will be 4ish hours on numerous legs, should and CAN we purchase locks for our luggage to hitch it to the post to avoid the off chance it would "walk off" the train?

Any suggestions for products that would work?