Blister 1 and Blister 2

Blister 1 and Blister 2 are twin miniature gauge diesel engines from the Arlesdale Railway that arrived on Sodor in 1967 to help construct the railway. They are named after the injury: "blister" for the problems they have in winter.

They work as station pilots at Arlesburgh and are also used for maintenance and in case of emergency.