No.4 Edward Thomas at Abergynolwyn, 25 Mar 2005. No.4 was built in 1921 by Kerr Stuart of Stoke-on-Trent for the Corris Railway, and was bought by the Talyllyn along with No.3 in 1951. It is named after Edward Thomas who had worked for the Talyllyn from 1897, retiring as Manager in 1950.