"As I see it the movement could have had both up and down lines blocked for up to 10 minutes. The OSL could need 2 minutes to time out. The operation could read as follows:- train comes to halt, engineman gets off engine and goes to pill box, fumbles for key and opens box, then phones cabin, gets response, closes and locks pill box, operates OSL, waits for time out, then the switch is reversed, the engineman climbs back in the cab, right of way is given, brakes released, train moves to yard, guard signals train clear of fouling point, train stops, guard gets off train and walks back to switch stand, guard put switches to normal, line now clear."
Almost all correct.
The crew spoke to Metro Train Control. The Outlying Switch Lock was released and could only be operated whilst the UP Absolute protecting the crossover at Cabin E was at STOP. The Guard usually dropped off as the train pulled into the yard (but not always)
"All the above is why I can't get interested in model trains, you just can't reproduce the operating atmosphere, even the tedium."
Freight forwarders similarly lost interested in railways until this was rectified in the 80's by places such as Islington Freight Terminal, containers, high(er) speed non-stopping trains, 2 person crews, and all of the other "non atmospheric" realities of life.