Train branding involves utilizing the exterior and interior spaces of trains to display advertisements, offering unmatched reach across cities, states, and even countries. Exterior train wraps allow brands to cover entire train carriages with eye-catching graphics, ensuring visibility along the train's route, including stations, level crossings, and public viewing points. Interior train branding includes seat backs, window panels, digital screens, tray tables, and overhead luggage racks, providing brands with multiple touchpoints to engage passengers during their journey. Train branding is particularly effective for long-duration campaigns aiming to build mass awareness and brand recall. This medium is widely used by telecom companies, tourism boards, FMCG brands, financial institutions, and entertainment sectors to reach a captive audience. The mobility of trains ensures exposure in both urban and rural regions, extending brand reach to areas where other media may have limited penetration. Moreover, train branding can be augmented with interactive elements, augmented reality, or QR codes, enabling audience engagement even during transit. The longevity, high-impact visuals, and national reach make train branding a powerful OOH advertising medium.