Many Brits sigh at the thought of hopping on a train, with commuter routes always bustling and the chance of a seat often very slim. And to make matters worse, they can be eye-wateringly expensive. It makes you wonder, then, what journeys in the UK would look like if we had double-decker trains . In some countries, double-decker trains are already in operation and some people on social media cannot believe it. TikTok user caitlinallisonn recently shared a video on the social media platform