Sir William Arthur Stanier, was a British railway engineer, and was chief mechanical engineer of the London, Midland and Scottish Railway.

The London, Midland and Scottish Railway (LMS) was a British railway company. It was formed on 1 January 1923 under the Railways Act 1921, which required the grouping of over 120 separate railways into four. The companies merged into the LMS included the London and North Western Railway, the Midland Railway, the Lancashire and Yorkshire Railway, several Scottish railway companies, and numerous other, smaller ventures.