No. There is no schedule for the delivery of new forms of transport that we can be overdue on; they emerge when technology and economics make them possible.
A new transport technology can emerge if it can demonstrate that it is better in some way relative to existing technologies. It would be great if Hyperloop can do something like that, and R&D should be encouraged. But it’s not at all clear how it could effectively be better than existing solutions.
It depends on what you mean why "new." Trains existed before WWII, but high-speed trains only began to be deployed in the 1960s, with the Japanese Shinkansen. Modern high-speed trains are more than twice as fast as the fastest WWII-era trains.
* The American Morning Hiawatha ran at a top speed of 160 km/h in 1939.
* The Japanese Shinkansen ran at a top speed of 210 km/h in 1961.
* The French TGV reached 300 km/h in 1995.
* The Chinese Fuxing trains have been running commercial service at up to 350 km/h since 2018.
The privately built new York subway system was actually built on a complicated contact system with the city, which today would be called a build-design-operate-maintain Public private partnership.
The privately built high speed rail lines in the world... wait a minute, those don’t really exist. Even in Japan the public was involved with the construction of hsr...
...just like the public is involved in the construction of any transport infrastructure.