World War I intervened; Bulleid joined the British Army and was assigned to the rail transport arm, rising to the rank of Major.
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The Grouping in 1923 of Britain's financially troubled railways saw the GNR subsumed into the new London and North Eastern Railway (LNER), and Gresley was appointed the CME.
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He led the first major dieselisation programme, which involved the procurement of diesel multiple units from AEC of Southall, 94 diesel locomotives (60 CIE 001 Class and 34 CIE 201 Class) from Metropolitan-Vickers and 12 Sulzer-engined diesel locomotives (CIE 101 Class) from the Birmingham Railway Carriage and Wagon Company.
The 1940s Southern Railway designs of Oliver Bulleid produced a very clean, modern-looking carriage, many of the features of which were perpetuated in the BR standard (Mk. I) designs.
The SR West Country and Battle of Britain classes, collectively known as Light Pacifics or informally as Spam Cans, are air-smoothed 4-6-2 Pacific steam locomotives designed for the Southern Railway by its Chief Mechanical Engineer Oliver Bulleid.
Oliver Cromwell | Oliver Stone | Oliver! | Oliver Goldsmith | Oliver | Jamie Oliver | Oliver Wendell Holmes, Jr. | Oliver Sacks | Oliver Wendell Holmes, Sr. | Oliver Twist | Oliver Wendell Holmes | Oliver Hardy | Oliver Reed | Oliver North | Oliver Nelson | Oliver Hazard Perry | Oliver Lake | Oliver Heaviside | Oliver O. Howard | Oliver Tambo | Oliver Lodge | Oliver Letwin | Oliver Kahn | Oliver Knussen | Paul Oliver | Oliver Tompsett | Oliver Pocher | Damien Oliver | Susan Oliver | Oliver Dragojević |
This livery was continued under Oliver Bulleid despite his experimentations with Malachite green, though the 'Southern' lettering on the tender was changed to the 'Sunshine Yellow' style.