NARVA lamps for railway signaling systems - the best lighting solution for rail safety. NARVA lamps do more than just meet the legal requirements in terms of service life, color location specifications and light intensity distribution specifications, for example. As a result, customers benefit from long replacement cycles, safe and precise functionality and therefore lower maintenance costs. NARVA lamps have been used for many years at level crossings, at switches, as warning lights, as platform signals and along the tracks.