I suspect their extensive rail system* is the logistical backbone of their defense plans. ...of course key tunnels and bridges will have mines (in the old demo

I suspect their extensive rail system* is the logistical backbone of their defense plans. ...of course key tunnels and bridges will have mines (in the old demolition sense) in place to deny the infrastructure to an opponent. Same as they've done their road passes. *https://www.railplus.com.au/images/maps/switzerland_map.jpg https://www.railplus.com.au/images/maps/switzerland_map.jpg