Joseph Hamilton Beattie

Joseph Hamilton Beattie (1808–1871) was an Irish-born British locomotive engineer who served as Locomotive Superintendent of the London and South Western Railway at Nine Elms Works from 1850 until his death in 1871, notable for his innovative approach to locomotive fuel economy and for developing the well-tank designs that gave the LSWR's suburban services their characteristic motive power through the mid-Victorian era.

Born at Coleraine, County Londonderry on 6 May 1808 and educated at Trinity College Dublin, Beattie joined the LSWR in 1837 under Joseph Locke as Carriage Superintendent — an unusual background in carriage and wagon engineering rather than the locomotive department — before succeeding the previous Locomotive Superintendent and taking charge of Nine Elms Works in 1850.

Beattie's engineering interests centred on fuel economy, a practical concern given the LSWR's extensive mileage and the cost of coke and coal in the mid-Victorian era. He developed the Beattie firebox, a combined inner and outer firebox arrangement that attempted to improve combustion efficiency, and experimented with mixed fuel burning. His well-tank designs for suburban service were his most enduring practical contribution: locomotives with the water carried in a tank between the frames rather than in side tanks, giving a lower centre of gravity and better weight distribution for the intensive start-stop working of the London suburban services.

Beattie died in office at London on 18 October 1871, still serving as Locomotive Superintendent at the age of 63. He was succeeded by his son William Beattie, who continued his designs, including the Beattie Well Tanks of 1874–75 that proved so durable that three examples lasted in service on the Wenford Bridge mineral branch in Cornwall until 1962 — nearly a century after the design's origins.