Integration of conventional locomotive cab alertness/safety system with ultrasonic (and other) devices and monitored through an on board microprocessor. The objective being a tamperproof, reliable, inexpensive, and easily installed means of measuring and maximizing crew alertness without physcal discomfort. Surveilance frequency and variable menu can be linked to random selection and to programmed imput, such as train speed or route location. This is the end of the technical abastract.