PARIS, May 1 -- If you're a regular train passenger, you probably bring reading material and download some Netflix series to catch up on for those moments when watching the landscapes out your window no longer holds your interest.

But the German national rail company is betting on passengers being interested in more romantic activities during long journeys.

It's testing out a new design featuring compartments that offer absolute passenger privacy for couples who want to get intimate during the trip.

It's a fantasy that's been around for generations, fuelled by cinema: getting intimate in the cramped lavatory of an airplane cabin.

In theory it can be subject to legal repercussions in various jurisdictions, as sexual intercourse in an a...