Using CALL and RETURN

Where you want to use the same sequence of commands from several places in other sequences you can avoid copying the repeated stuff by using CALL and RETURN

ROUTE(1,"Platform A to mainline")
  CALL(911)
  THROW(1)
  CLOSE(2)
  DONE

ROUTE(2,"Platform B to mainline")
  CALL(911)
  CLOSE(1)
  CLOSE(2)
  DONE

SEQUENCE(911)
  SERVO(123,100,Slow)  // move the cow out of the way
  PLAYSOUND(500,3) // Make it Moo
  DELAYRANDOM(5000,10000) // make the route wait 5 to 10 seconds
  RETURN      // return to the calling sequence

Notes

You can nest CALLs 4 deep.
If the called sequence executes a DONE statement, the task is terminated and there is no return.