DMC 3908 in Hainault depot

Just visible in front of the drivers cab side window is a metal bracket which was used to carry a rear view mirror! These were needed as the trains were used for One Person Operation (OPO) where mirrors or monitors would normally be installed but some stations had not been so equipped.
Also just visible pn the corner of the cab front - in line with the light cluster - is a small logo believed to be the crest of the Central London Railway - the predecessor of the Central Line.