I once travelled with my now-wife through a few former Soviet bloc countries via overnight trains in the early naughties. We travelled through Czech, Bulgaria,

I once travelled with my now-wife through a few former Soviet bloc countries via overnight trains in the early naughties. We travelled through Czech, Bulgaria, Poland, Slovenia to name a few. We hired the best "couche" room we could on the train. Normally equipped with foods, a bottle of spirits and some music. During our travels we loved these trips. They were no frills though - Soviet era train services are very basic. But we saved a nights accommodation every trip doing this and had great fun en route.