Got to wonder why - while they were paying people to begin 'installing and modifying hundreds of signals to prevent trains from going too fast' - they didn't m

Got to wonder why - while they were paying people to begin 'installing and modifying hundreds of signals to prevent trains from going too fast' - they didn't modify the signals so they could be remotely re-configured. Something in that system must be configured to be resistant to superior technology. Cuz it couldn't be the humans, right?