Set the speed to 0 (power off) within all block section and switch all signals
to red. The clear command represents the "emergency stop"
"help" : RC-> h [<command>]
The help command without argument displays a survey of commands recognized by
trainctrl. If a particular command is specified, trainctrl displays a more
detailed description of the command's usage.
"quit" : RC-> q
"quit" : RC-> e
"quit" : RC-> x
Terminate trainctrl. A clear command is executed automatically.