British Railways Illustrated Volume 5 No. 5 of February 1996 included an article about the LNWR goods yard at Edge Hill, Liverpool.
In 1850, the Edge Hill yards occupied 40 acres, with room for 1,782 wagons. By 1873, the yards spread over 104 acres and could accommodate 3,215 wagons. In 1894, they were 200 acres in size, with 60 miles of lines with a capacity of 6,828 wagons. At the turn of the 20th century there was still space on the site for further expansion, if required.
The gradient across the site meant that wagons moved around the site under their own weight. To prevent dangerous runaways a system of hooks attached to heavy chains was employed at key locations across the site.
http://rogerfarnworth.com/2025/04/06...unaway-wagons/