This locomotive was built by Avonside Engine Company Ltd of Bristol in 1910 for use on Woolmer Instructional Military Railway.
The railway had been established in order to train staff for using railways overseas to supply ammunition, troops and essential supplies. From 1933 tThe railway connected to the mainline at Liss on the Waterloo to Portsmouth line.
In 1935 the railway was renamed as the Longmoor Military Railway.
The locomotive was preserved at the Royal Engineers Transport Museum at Longmoor from September 1954 until it was moved to the Army School of Mechanical Transport at Leconfield on Humberside in July 1977.
In November 1979 the locomotive was moved again – this time it went to the National Railway Museum at York. The locomotive relocated to the Museum of Army Transport at Beverley on Humberside in March 1983.
More recently Woolmer has been loaned to the Milestones Living History Museum in Hampshire.
| Home Base | Current Status | Owner |
| National Railway Museum – On loan to Milestones Living History Museum in Hampshire | On static display | National Railway Museum
NRM Object Number{2008-7159} |
