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| Number | Title | Issue Date |
| 6088635 | Railroad vehicle accident video recorder A method and monitoring unit for recording the status of a railroad vehicle prior to a potential accident. In a monitoring unit mounted in or on a railroad vehicle, such as a locomotive, a video camera is provided to continuously view a scene that the rai... | 07/11/2000 |
| 5924653 | Traffic control system and method of controlling the movement of a mobile unit A traffic control system for mobile units has a plurality of stationary, passive units having electronic store capacity and transmit and receive facilities. The store of the passive units contains an information code which is unique to the unit and is rel... | 07/20/1999 |
| 5131612 | Arrangement for positively determining the actual sounding of a warning horn on a railway vehicle A system for positively determining that an engineman has actually activated a manual whistle valve to sound a pneumatic warning horn on a railway vehicle having a low pressure and high pressure sensing apparatus for conveying signals to an event recorder... | 07/21/1992 |
| 5109343 | Method and apparatus for verification of rail braking distances A braking distance verification system is disclosed which makes use of a specially designed pulse to voltage converter circuit and a portable computer-based data acquisition system to measure grade, speed, and distance information of any rail vehicle. The... | 04/28/1992 |
| 4361825 | Automatic train-line air brake pressure monitoring system In an automatic train-line air brake pressure monitoring system, a peak detector and hold circuit determines the peak voltage of an input signal representing the air pressure in the air brake system. A signal representing the present peak voltage of the i... | 11/30/1982 |
