It’s fascinating to read but I have a hard time imagining a public western railway provider could evolve into a train based mega corporation doing real estate and health services.
They also have an energy company which runs some hydroelectric power stations.
Deutsche Bahn does everything from real estate to infrastructure to truck companies (no longer in Europe, though, they had to sell that off) to car sharing to energy production to IT development to trading lumber, workforce rental and startup venture capital. The list changes every few days, so some they may no longer do, others they will now do. It's a megacorp.
Many of these have grown out of the original business model.
Without the public or central government support, the efforts you're talking about amount to very little.
Liverpool Street isn't managed by TfL, it's managed by Network Rail.
It's brilliant if you think about it. By building super convenient rail transport you essentially lock people into your territory and businesses. They go by foot so they can't get far. If they want to go somewhere else, they probably have to take your rail network and only end up at your other properties. With some aggressive horizontal integration, you can essentially built a small kingdom.