>> The Elizabeth Line was unbelievably expensive to build; that's how the UK did it.

Fair. But what is also expensive is every single citizen taking $100 Uber rides to the airport, like in NYC. In NJ, the transit service has become so volatile and sporadic and opaque that people have reduced NJTransit use for Newark airport in favor of simply driving.

But it is also really good. I love the completely enclosed platforms, ie shielded from the track and train by a glass wall/doors, like the Jubilee line, but all the way to the ceiling. This makes it both safe and very quiet.

Though the platforms are huge, as the trains are long, you have to really make a conscious decision on which exit to use as they come up very far from each other. Unlike other tube stations, where if you don't pick the most optimal exit, you just have to cross the road.

It's a massive investment in the areas near its stations.