Does anyone know when each LU line and each LU stock got rid of Guards and went DOO? I seem to remember the last one was the Northern Line which had Guards on the 1959 Stock up until withdrawal and was DOO on the 1995 Stock from introduction but i am wondering about the other lines? Did all other lines go DOO at the same time new stock was introduced? Or were there any periods when the A/C/D Stock and 1967/1972/1973 Stock etc had Guards too? If anyone knows more about which stocks had Guards and when each line and each stock went DOO that would be much appreciated?