The Queensland Railways A12 class locomotive was a class of 4-4-0 steam locomotives operated by the Queensland Railways.

In 1878, the Queensland Railways took delivery of three 4-4-0 locomotives built by Baldwin Locomotive Works.

Two entered service on the Southern & Western Railway and one on the Central Railway.

Per Queensland Railway's classification system they were designated the A12 class, A representing they had two driving axles, and the 12 the cylinder diameter in inches.

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