I think if you were to do something like a DC-to-New York Hyperloop, I think you'd probably want to go underground the entire way because it's a high-density area.
Manuprāt, ja vēlamies, piemēram, hipercilpas trasi no Vašingtonas līdz Ņujorkai, to droši vien vajadzētu visā garumā būvēt zem zemes, jo tur ir ļoti blīva apbūve.