US Patent Issued to BNSF Railway on July 28 for "System for testing railroad crossing signals" (Missouri Inventor)

ALEXANDRIA, Va., July 28 -- United States Patent no. 12,691,917, issued on July 28, was assigned to BNSF Railway Co.

"System for testing railroad crossing signals" was invented by Joshua A. Applegate (Queen City, Mo.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A railroad crossing signal test system includes a power source, a timer device configured to provide periodic electrical pulses, and first and second relays. The first relay can be configured to alternately provide the periodic electrical pulses to a left and right light of the railroad crossing signal. The second relay can be configured to alternately change a polarity of a common connection between the left light and the right light of the railroa...