These engines, which are situated in the Engine House visible from the M62, used to power one of the last steam driven Lancashire Mills. The mill itself has since been demolished, but the twin engines Victoria and Alexandra are preserved and run monthly for visitors. They are the largest mill engines surviving and used to power the mill machinery via a ropeway around the flywheel in the picture which in turn drove the lineshafts on each floor of the mill.
SD9311 : Ellen Road Mill Spectacular sight when it was all there. A real joy to see it when coming west on the M62. I've just found some 1984 monochrome images. They are very likely to get a Geograph outing in the next few days.