A system and method for adjusting power employed by a light emitting device used for medical applications, such as measurement of patient parameter. The ECU determines whether count by the time lapse counter has exceeded a predetermined defined time or not, and it does not permit engine stop until count by the time lapse counter reaches the predetermined defined time and permits engine stop when count by the time lapse counter has exceeded the predetermined defined time. The train is forced to come to a complete stop before proceeding past the device or may be slowed down to a speed that will allow the engineerconductor to visually determine whether it is safe to proceed past the device if the engineerconductor acknowledges a message warning of the malfunction and will stop the train if the engineerconductor fails to acknowledge the warning message. The semiconductor area borders on the first barrier area and is an intrinsic semiconductor area, or has the first or second conductivity type and a dopant concentration which is lower than a dopant concentration of the first barrier area. When the control module is set to the deployed mode, the lift bladders are vented and the load bladders are inflated and maintained at the regulated pressure.