Cycling is a great way to travel short journeys but for most people cycling further than a few miles is not an option they would sensibly consider. That’s where combining cycling with rail travel makes perfect sense. Ride a few miles to the train station, get on the train (with your bike) and then ride few miles at the other end.
The problem is that the train companies don’t want bikes cluttering up their trains, they want that space filled with fare paying passengers. This makes sense especially on commuter trains which are usually overcrowded already. The train companies’ solution is for everyone to have a bike at each station. This might be acceptable for commuters on a regular journey (although I doubt it), but it’s not a general solution. Their more general answer is that you hire a bike at your destination, but that’s extra expense and the bike you get is probably not that great or might not be suitable (has no racks or no child seat for example).
What’s really needed is a way to carry bikes on the trains which doesn’t reduce the amount of space in the trains and which is cheap and easy to implement. That’s exactly what’s pictured above in use in Stuttgart. Obviously that exact solution is probably not suitable to for trains travelling at 80+mph but the principle still holds. Why can’t trains in the UK have some no frills space for bikes? We used to have guards vans attached to the back of the train which served this purpose. Why can’t we have them again?