Millhall was Polmaise 1 & 2 while Fallin was Polmaise 3 & 4.
I worked at Millhall just after I left school as a 15 year old in 1953. I think I was 16 before I was allowed to work underground.
My father was a Fireman/Shotfirer there. Part of his duties was to walk, every Sunday morning, along the three mile escape route between Millhall and Fallin checking that everything was sound, undertaking any necessery repair work and reporting any required larger maintanence jobs.
He was allowed to stand on the open platform of the double-decker bus from fallin back to Millhall.