Coal-fired Lancashire steam boilers once used to drive the steam engines at Tower Bridge London which in turn drove the high pressure water pumps for the hydraulic system which operated the bascules to raise/lower the road sections.

The following photos provided by Paul Yunnie unless otherwise acknowledged

Brighton Engineerium 1934 Four Yates & Thorn Lancashire Boilers
Note the rail line to bring in the coal trucks

Photo taken in August 2011 by F J Ferris

Left hand photo shows the front face plate of one of the original Lancashire steam boilers,
Right hand photo is a cut-a-way section showing the two internal firing tubes and waterway.

Crofton Pumping Station, Wiltshire - Kennet & Avon Canal

The British Houston Factory
Three Henry Hope & Sons - Lancashire boilers each 30 feet long x 8 feet dia.
High pressure steam used for power and manufacturing and reduced to
atmospheric pressure for central heating and hot water supplies.