The two Black Widow SP F-units on the main showed up on the point 110 (a first class train) just as YM Pete was getting started on the block swap for 200.
Because 110 is higher priority, 200 gets to wait while 110 gets served first.
To add to the confusion 110's crewman is Pete (sencond on the left) while the YM is also a Pete. Rodger (foreground) looks on enviously while Pete gets all Pete's attention.
To misquote a line from Monty Python, "Oh your name's not Pete then? Say would you mind if we called you Pete to help avoid confusion?"