The application axis of Railway Relays market segmentation allocates demand across five functional domains: Signaling (40 %), Power control (25 %), Safety systems (20 %), Communication (10 %), and Automation (5 %). Signaling relays, responsible for route setting and train detection, remain the largest driver, reflecting extensive network upgrades and regulatory pressure for fail‑safe operations. Power‑control relays manage traction and auxiliary power distribution, supporting electrification projects and thus contributing a quarter of market value. Safety‑system relays, embedded in emergency braking and intrusion detection, sustain a substantial share due to stringent safety standards. Communication relays enable data exchange between wayside equipment and control centres, a growing niche as IoT adoption rises. Automation relays, though a smaller slice, are critical for driver‑less train trials and predictive maintenance platforms. The pie‑chart in the root node visualises these percentages, providing a concise view of Railway Relays segmentation by application.