> * I actually know the answer to this one and it's actually a technical constraint. The PATH system uses MTA like third rails for power. The mainline track system uses overhead lines for power. Having the PATH continue to EWR would require investment in parallel infrastructure between Newark Penn Station and EWR. Of course PATH is maintained by the Port Authority and the mainline track by NJ Transit, each of which has its own agenda and budget so it'll never happen.
Why is that a technical constraint? The mainline system uses third rail from Grand Central Terminal to Pelham, where it switches to overhead line equipment, so even in a US setting it's clear that switching between power supplies on the move and dual-compatible stock is no problem.
Why is that a technical constraint? The mainline system uses third rail from Grand Central Terminal to Pelham, where it switches to overhead line equipment, so even in a US setting it's clear that switching between power supplies on the move and dual-compatible stock is no problem.