Now, because “getting on or off moving equipment, except in emergency, is prohibited,” applies almost everywhere, one has to doubt it.
The advantage of the on the fly crew change had a lot to do with the brake release difference between the AB and later (ABD, ABDW,) braked trains. When slowing a 1950’s 100 car generic “freight” train (now box, tanks, gons…like that) putting the handle into running/release with the train brakes applied at under 30mph was a gamble except for the old heads. For them the way the train handled told them if they could get away with a “running release.”
We’re involved with long release times. If a stopped crew change were done according to the air brake rule at crew change points that amount of time for the brake release would be added to your running time. Suppose you needed 12 minutes to clear an opposing train a siding away from the crew change…if you didn’t get there a superior following train would prohibit you from leaving.
The AB release after a stop takes more than a minute; the ABD takes about 20 seconds. So, in AB days after taking an engine from an inbound crew you have that release time to add to your running time.
But change on the fly…that running release artist, who crept up to a siding switch allowing a brakeman drop off, run ahead, line you into a siding for a meet, could help you make a “good” trip when he (“She”’ weren’t in the business then) brought a train in to allow a moving head-end crew change…a couple of minutes----yeah!
I can’t imagine it in steam.
Nor can I imagine it with covered wagons…F’s, FA’s, C-Liners, Sharks from Baldwin…
Gotta get your grip up there and the engr’s… he’s on the point and you’re putting on the baggage on the second unit, a GP9. The point is a Black Widow…highball Santa Barb…
done that in 1963, been there
one more ride way out there Pioneers.