The Billups Neon Crossing Signal was a prototypical grade crossing signal installed at a dangerous Illinois Central crossing on Mississippi Highway 7 (now Mississippi Highway 332) in Grenada, Mississippi. The onset of World War II brought about a scarcity of neon which, when coupled with maintenance problems with the signal (often manifesting themselves in the siren going off and not shutting down until a crew arrived) meant that no further signals were produced. The prototype was removed after less than thirty years of service.