LMS diesel shunter 7057 was built by Harland & Wolff. Testing started in July 1934 and the locomotive was taken into LMS

London, Midland and Scottish Railway

The London Midland and Scottish Railway was a British railway company. It was formed on 1 January 1923 under the Railways Act of 1921, which required the grouping of over 120 separate railway companies into just four...

 stock in February 1935. It was loaned to the War Department

War Department (UK)

The War Department was the United Kingdom government department responsible for the supply of equipment to the armed forces of the United Kingdom and the pursuance of military activity. In 1857 it became the War Office...

 between 1941-1943, which numbered it 233.

Conversion

It was withdrawn from LMS stock in January 1944 and sold back to Harland & Wolff, which rebuilt it with a new 225 hp (168 kW) engine and converted it to the Irish 5 ft 3 in gauge. It was then sold to the Northern Counties Committee

Northern Counties Committee

The Northern Counties Committee was a railway that served the north-east of Ireland. It was built to Irish gauge but later acquired a number of narrow gauge lines...

, which numbered it 22.