This paper examines the ongoing development of the Gemas–Johor Bahru Electrified Double-Tracking Project (EDTP) and its anticipated impact on Malaysia’s urban rail infrastructure and passenger experience. The 197-kilometre project, valued at MYR7.13 billion, involves the construction of stations, depots, viaducts, bridges, and signalling systems. Employing a mixed-methods approach across three research stages. The research evaluates expected improvements in infrastructure, travel time, and traffic control, while also identifying gaps in digital amenities and service frequency. Key findings highlight high passenger satisfaction with pricing and security but also reveal areas needing enhancement such as internet connectivity and scheduling flexibility. The study contributes to the literature by linking infrastructure upgrades with user experience metrics and offers recommendations for future railway planning and policy. Despite limitations in operational coverage, the findings aim to support sustainable urban development and encourage a modal shift from road to rail.