Large numbers of the NER G6 0-4-4WT class were made redundant during the 1890s. Forty of these were rebuilt as 0-6-0Tshunting locomotives at York Works between 1899 and 1904. Ten further were rebuilt at Darlington, in 1907-8 and a further ten in 1921.
They were used for general shunting and marshallingcoal trains. Withdrawals started in 1933 but 45 survived into British Railways ownership in 1948. Their BR numbers were 68390-68440.