Last year, while we were staying in London, I got to take my first trip on the Elizabeth Line or what was known for a long time as Crossrail.  This is a major addition to the transportation network of the town and appears to have been very successful.  I only took one trip through the core of town and one to the airport.  It was a very quick way to cover a journey that previously was a lot more drawn out.  However, the thing that impressed me most was the stations.  They are huge.  The trains are long from the start, but they have built capacity to have them longer and the platforms are about 250m long as a result.  You need to know which end to get out to make sure you don’t find yourself several blocks from where you intended when you get to the surface.