The old boilers were cylindrical single-ended boilers fitted on in 1883.

For this reason they were not commonly used, although back-to-back arrangements of multiple single-ended boilers were common.

There was also one single-ended boiler for auxiliary machinery and one, smaller donkey boiler.

She was powered by twin quadruple-expansion steam engines powered by three double-ended and six single-ended boilers.

Steam at 215 psi was supplied by burning oil fuel, with forced draught, under four double-ended and two single-ended boilers Scotch boilers.

Their machinery would include six double-ended boilers and one single-ended boiler and three turbine sets were to drive three propeller shafts.

Steam at a pressure of 220 lbs p.s.i. was supplied by two double-ended and two single-ended boilers adapted for Howden's system of forced draught.

Her powerplant consisted of two vertical triple expansion steam engines, with nine single-ended boilers in two boiler rooms separated by a watertight bulkhead .

The ship was fitted with 23 double-ended, and two single-ended boilers (which fitted the forward space where the ship narrowed), operating at a maximum 195 psi and containing no fewer than 192 individual furnaces.

CC1's double-ended boiler design contrasted with Leader's single-ended boiler; the boiler was also located in the middle of the locomotive, rather than towards one end, and was not offset from the locomotive's longitudinal centre line.

This locomotive would have had a single-ended boiler barrel (still of square section) with a cab located at the firebox end of the boiler; water tanks would be located at either end of the locomotive and a bunker at the cab end.