The side doors to the cab have been replaced by droplights and the train will not start unless these are closed or within a few inches of the closed position.

He was a tall, hefty man.

telecheck

While comm buoys allow rapid transmission, there is a finite amount of bandwidth available. Given that trillions of people may be trying to pass a message through a given buoy at any one time, access to the network is parceled out on priority tiers.