Abstract: A drain valve for use in the cooling system of a diesel engine for a locomotive including a valve body having a drain fitting mounted in the bottom portion thereof and a solenoid operated valve assembly mounted therein for opening and closing the drain fitting. A thermostat assembly is removably mounted on the exterior of the valve body in close thermal relationship to the interior of the valve, said thermostat operable to energize the solenoid and open the drain fitting when the temperature inside the valve reaches a predetermined minimum.

Abstract: The invention disclosed herein provides an electronic digital gauge for measuring the magnitude of different physical characteristics. A plurality of transducers are provided having different signal voltage output characteristics including a stand off voltage. A plurality of adjustable compensating scaling means each provide matching calibrated outputs proportional to the changing signal voltage and to the stand off voltage of a given transducer. The scaling means comprises resistive voltage divider networks including potentiometers which are calibrated in conjunction with a conventional analog to digital conversion and display means having an input which receives the calibrated outputs. The display means provides a digital read out generally equal to the magnitude of the characteristic measured by one of the transducers.