It was originally built of wood, but was rebuilt in masonry and slate in the Winter of 1872-3 and further rebuilt by adding a wooden extension in 1911 to cater for the two locomotives participating in the automatic control trials.
It was originally built of wood, but was rebuilt in masonry and slate in the Winter of 1872-3, with part of the originl shed retained at the northern end to act as a workshop. In 1911 the shed was extended at the southern end to cater for the two locomotives participating in the automatic control trials.