These were supplied in 1839 and four more were supplied to the GPK&R in 1840:  Mercury (No 1), Mazeppa (No 2), Wallace and Queen. In 1849, they supplied one of 2-2-2 formation for use on the Caledonian and Dumbartonshire Junction Railway, which later became part of the Edinburgh and Glasgow Railway.
Those for the GPK&AR were Stuart and Bute. They were probably similar to those for the MCR and of the 2-2-0 "Bury" type.