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| Number | Title | Issue Date |
| 5864304 | Wireless railroad grade crossing warning system A railroad-crossing warning system for protecting pedestrians and motorists from an oncoming train. The warning system has a vehicle detector system for determining whether a vehicle is stuck in an area of the railroad crossing, a train detector system fo... | 01/26/1999 |
| 4122523 | Route conflict analysis system for control of railroads A centralized traffic control system for complex railroad areas analyzes the intended path of travel of various trains to determine the existence of any conflicts. When one or more conflicts are detected, the system analyzes various options to resolve the... | 10/24/1978 |
| 4073453 | Railroad warning signal device A warning device visually enhances the signalling of a dangerous situation such as an approaching train at a railroad crossing. The warning device includes oppositely rotating rims to which light reflecting discs are attached in surrounding relation to hu... | 02/14/1978 |
