ET3 has very high capacity
ET3 is NOT a train, the design philosophy is more like an automobile operating on a freeway; but automated so the vehicle frequency can be much greater. (Just as automated telcom has much more capacity than human switchboard operators of 100 years ago). At 350mph, a single 5' (1.5m) diameter ET3 tube has the passenger capacity of 20 lanes of highway traffic (over 10 capsules per second). This is also 10 times the capacity of a high speed rail line.