The Brooklyn Hanson siding leaves the mainline just North of Somerville Rd. It crosses Somerville Rd immediately West of McDonald Rd, as distinct from the mainline, which crosses Somerville Rd about 150m East of McDonald Rd.
Just before it crossing Somerville Rd a second siding branches from the Hanson siding, both cross Somerville Rd together, the other siding (West of the Hanson siding) runs into the former Brooklyn tip, this is currently disused. The Hanson siding goes through a pair of gates (which are left padlocked when there is no train using the siding) and then rounds a curve before running parallel with Bunting Rd.
The line then crosses Bunting Rd before entering Hanson's Brooklyn Concrete Plant.
It sees regular use, pretty much daily.