Greenies and Nimbys will put a stop to this. Count on it.
Somebody’s going to make money on it.
“Greenies and Nimbys will put a stop to this”
They won’t have to.
The engineering concept simply wont work.
There is no way possible you could support a pipe that size with supports 50 to 100 yards apart.
Without proper support, or regular rotation, pipe that size will turn into an oval instead of round and it will sag just like a power line.
That toy train will get stuck in that pipe unless it’s properly supported.