They don't have to be isolated. I've ridden on a GoA4 train, right up front that was following a GoA0 human-driven train - for much of the trip I could see the tail lights of the train ahead. As the line still had manually driven train sets it still had functioning line side signals, so I could clearly see the signal indications facing my auto-driver operated train.Transtopic wrote: ↑Sat Apr 24, 2021 11:31 pm There would be additional cost involved in isolating automated (driverless) operation from other adjoining rail services on the legacy network, which would make its implementation economically questionable, compared with the Level GoA2 with a driver monitoring the system, which in an operational sense gives the same benefits.
Admittedly this was a transitional arrangement as it wasn't viable to replace 90+ train sets on the line all at once. So as each new fully automated train set was delivered, a manually driven train was taken out of service.