Mallard lost its valances during a works visit 13 June 1942 , regaining them in preservation in 1963 .
The A4 class was built with streamlined valances , or side skirting , but this was removed during the war to ease maintenance .
Mallard lost class ' valances during a works visit 13 June 1942 , regaining them in preservation in 1963 .
The A4 class was built with streamlined valances , or side skirting , but this was removed during the war to ease maintenance .