Baldwin Narrow Gauge 4-6-2 (NG10 type)

Baldwin Locomotive Works of Philadelphia, Pennsylvania, was the largest locomotive manufacturer in the world at its peak, producing tens of thousands of locomotives for railways across the globe, and its narrow-gauge Pacific-type and other small locomotive designs were supplied to British colonial railways, military light railways, and a number of preserved British heritage railways. Baldwin's narrow-gauge designs became particularly significant during the First World War, when the firm supplied large numbers of light narrow-gauge locomotives to the military light railways of the Western Front and other theatres, and subsequently many surplus Baldwin locomotives entered civilian service on British and colonial narrow-gauge railways after the Armistice.

The Baldwin narrow-gauge Pacific — with its 2-6-2 wheel arrangement and compact dimensions suited to the very light track of military and plantation railways — was a standardised product that Baldwin could supply rapidly in large quantities to military requirements. After 1918, surplus Baldwin narrow-gauge locomotives were acquired by various civilian narrow-gauge operators, and several found their way to Britain's surviving narrow-gauge heritage railways where they continue to operate alongside more traditional British designs. The distinctive American engineering aesthetic — outside frames, bar frames, Belpaire fireboxes on some examples, and the generally more utilitarian appearance of American industrial practice — gives the Baldwin locomotives a character quite different from their British narrow-gauge counterparts.

Baldwin narrow-gauge locomotives preserved in Britain include examples at the Brecon Mountain Railway in Wales and the Lynton and Barnstaple Railway restoration project, where the Baldwin-built Lyn represents the narrow-gauge Atlantic tradition of that celebrated Devon line.