Train users now have to jump on a bus between Dapto and Bomaderry with trackwork underway on the South Coast line.
Buses will remain in place over the stretch until 3.30am Thursday before running between Kiama and Bomaderry until lunchtime Thursday.
Transport for NSW said buses travelling towards Dapto may leave from stations between Bomaderry and Albion Park up to 40 minutes earlier than the normal train timetable.
Transport for NSW is reminding commuters to plan before you travel for up-to-date information.
1SC: Kiama, then all stations to Bomaderry and return.
4SC: Kiama, then Dapto and return.
5SC: Kiama, then all stations to Oak Flats and return (by-passing Bombo in the Oak Flats direction).
32SC: Dapto, Albion Park, Oak Flats, then Kiama and return.
Images: Travis Winks and Sydney Trains