Rheneas was built by Fletcher, Jennings and Co. at Whitehaven and arrived on the Skarloey Railway sometime around 1866.
Unlike Skarloey, Rheneas was stern and thoughtful and fell out with Skarloey after the latter called him a "stick-in-the-mud" following an argument over cabs. The two reconciled after Rheneas saved Skarloey from a landslide.
Rheneas literally saved the railway by keeping service through through a very lean period in the late 1940s. By 1950, Skarloey was in need of repairs, leaving Rheneas to run the line. He managed to pull a full train home one rainy day despite jammed valve gear, and thus was rewarded with an overhaul. His overhaul took place in 1961 and was returned to the Skarloey Railway soon after.
Rheneas returned to service in 2002 after an overhaul that was started in 1999.