In Ireland, Córas Iompair Éireann used "heating cars" as standard and CIÉ diesel locomotives were not fitted with steam generators.
In 1903, Chicago businessman Egbert Gold introduced the "Vapor" car heating system, which used low-pressure, saturated steam.
In 1914–16, the Chicago, Milwaukee & St Paul Railway electrified some 440 miles (710 kilometres) of their line going over the Rocky Mountains and Cascade Range with the 3 kV DC overhead system.
[1] In Great Britain, steam generators were built for British Railways diesel locomotives [2] by three firms - Spanner,[3] Clayton[4] and Stone.
[citation needed] In Poland, vapor steam generators were fitted to diesel passenger locomotives of the SP45 class.
The boilers were removed in the 80s and 90s and replaced with 3 kV DC generators driven by main engine, when maintenance became too expensive and remaining cars not fitted with electric heating were withdrawn from service.
The New Zealand, electric locomotives class ED, used in and around Wellington, were fitted with oil-fired steam boilers manufactured by the Sentinel Waggon Works.
The New Zealand ED class (1,500 volts) electric locomotive used around Wellington from 1940 originally had oil-fired water tube boilers for passenger carriage steam heaters, which were later removed.