Medway Quarry railway line

The Medway Quarry railway line is a private freight railway line in the Southern Highlands of New South Wales. The line is used by freight trains to transport the products of two quarries to various locations in the state, mostly concrete plants.

The line was opened on 17 September 1928. It branched off the Main South line between Tallong and Marulan stations at Medway Junction, where there were a number of sidings and shunting necks. The line then ran approximately 7km south to Blue Circle Southern Cement Company's South Marulan Quarry, a large limestone quarry. The line was originally controlled by staff and ticket using a small signal box at Medway Junction.

In 1987, the quarry and railway were purchased by Boral.

Since then, at an unknown time, a balloon loop has been added and the staff and ticket has been upgraded to Train Order Working. As such, the signal box became redundant and has since been demolished.

In 2014, Peppertree Quarry opened. It is a granodiorite mine and is also connected to the line.