I took an overnight train from Latvia to St. Petersburg. My second sleeper car experience this trip. This time I had a roommate. A Russian kid who was nice, but spoke little English so we had basically no communication.

So far I've felt safe and comfortable in the sleeper cars. There are locks on the inside of the doors so no one could come into your car. And I was lucky enough that this was the only time I'd even had one person in the car with me. There also were bins under the bed where you can put stuff. So for anyone to steal anything they would have to lift your bed to get at it!

The service was good too. They came around with drinks and light food as part of the ticket price and supplied your cabin with fresh water.

The train was an old Soviet era train like out of a spy movie. Upon walking into the train the first thing I'm hit with is a coal burning stove! In the passenger compartment?!

But it was a smooth ride with little trouble at the border. They had some questions, but I didn't know what they were saying and they just ignored it.