[Poohbah]

And a follow up comment - you don't need to cover every inch, though that would be nice. Just cover enough that you're regularly catching any inappropriate interlopers.

In other words, every inch.

Because otherwise, the inappropriate interlopers will simply hit the rail line where it isn't being guarded.

Of course, there smart thing to do would be to lock down the borders, first, but I don't see that happening.

I've already figured out the manpower requirements for securing our borders and coastline: it isn't pretty.

[FreedomPoster]

No, not every inch. I'm not proposing obvious guard towers. And no, there would be no 100% certainty. But there would be an innoculating effect that could be sufficient.

On borders, if there were any national will to do it, we'd announce we are going to start shooting illegal crossers, then shoot a few. Illegal crossings would drop to a trickle, once the news got out. From that point forward, it would be much easier to spot a few, when the system isn't overloaded with a flood.