So I have noticed that sometimes after station stops, the conductor will call the arrival and departure times of the station, for example; if your arrival time was 6:45 and departure time was 6:50 they would say "45 and 50" on the radio. But after that, crews would say other numbers and/or say they have a "pair" of one of those numbers. For example,at the 1:30 mark. After the highball, the conductor says "52 and straight up" which indicates arr time 5:52 and dep time 6:00, but then he says "I have a pair of 50s coming up" This is what I am questioning, because I have heard it before on the radio and have never understood what they were referring to, and I could not find anything in the GCOR or Amtrak Service Standards documents that had any reference to this. If anyone has any idea what this means, leave it below.
Another example of this:at the 8:37 mark.
Another example of this: