Dialight's 891 Series LED Wayside Signal Lamp Modules provide a unique solution for transit railroad signals, allowing for LED upgrades without complete lens and housing replacements. These modules feature hi-flux LEDs for improved optical performance, flicker resistance, and reduced current draw. They are designed to fit existing signal heads, utilize existing outer lenses, and are compatible with various signal head manufacturers. The modules incorporate power factor correction and total harmonic distortion reduction circuitry, ensuring reliable operation in rail environments. They are certified for rail environments and include a rear indicator for maintenance crew visibility.