The locomotive type boiler was common among the standard oil country boilers. It resembled that of an early train engine and, in fact, was based on the famous Stephenson design in his 1833 locomotive from which other components of oil field steam engines were also derived including the link valve gear.

This configuration also increases the heating area and provides better water circulation than a plan locomotive type boiler. The Aster JNR D 51 and JNR 9600 utilize this type of boiler. Locomotive Type: The Locomotive type boiler, shown in Figure 8, consists of a copper barrel and an outer and inner firebox attached to the rear of the barrel.

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Briggs boilers as opposed to locomotive type are dryback type,i.e. no water jacket around the outside of the firebox. the biggest problem with this is the prodigous output of the fire in the firebox, close to 30 kW on a 7 1/4" gauge loco working hard emanates from said box via radiation with a consequent red hot firebox.

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An advantage of a locomotive boiler over other boilers of the era was a) rugged construction b) better cleaning and repair access c) improved water circulation d) less stays were required e) lower maintenance costs

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The Ferrovie dello Stato (FS; Italian State Railways) Class 741 is a class of 2-8-0 'Consolidation' steam locomotives, rebuilds from the FS Class 740 with a Franco-Crosti boiler; it was the last class of steam locomotives introduced in Italy.

"The modern Locomotive Question is principally a matter of boiler". G.J. Churchward, 1906. This article principally uses the GWR classification system for boilers, originated under Churchward, which divided boilers into classes based on the physical size of the boiler and thus which locomotives it will fit.