Sydenham Sydenham station originally opened on 1 March 1859, shortly after the railway line was extended from
Sunshine to Sunbury. In 1926,
interlocked gates were provided at the former
Melton Highway level crossing, which was located at the down end of the station. In 1987, they were replaced with
boom barriers. In 2015, the
Level Crossing Removal Authority announced the
grade separation of the highway and railway line. In January 2018, the Melton Highway level crossing (down line) was removed and replaced with a bridge for Melton Highway, with the project completed in October. In 2022, all three platforms were extended from to long. Upon the opening of the
Metro Tunnel in November 2025, Watergardens was served by limited weekend services through the tunnel, which terminated at Sunbury. All services running through Watergardens will operate through the Metro Tunnel from 1 February 2026, including a planned frequency of at least one train every ten minutes from 6am to 9pm on weekdays. == Platforms and services ==