Some Cabeeses had a brake wheel on both ends so, when that end was leading, as in a drop, or a kick, the Conductor could make a joint by gravity or momentum.
Coming into the Yard, from the West, here, we used to drop Cabooses over a mile, and let them go so fast they would pass their head end in the adjacent track. You then threw a pail of water at the opposite man, as he never heard you coming if in D/B.
This way the Caboose was at the Bull Switch end of the Yard for the S4 to grab, without having to go all around to get it from tail end.
There was a Bowl in the yard to capture kicked cars.
Now, to amplify on Rotary Drawbars.
Most Rotary cars had an identifying mark, stripe or herald on the Rotary Drawbar end so one could tell at a glance if Rotary end was against a Unit, Remote Slave Car, or Remote Units or Caboose.
Say the Rotary was on the front end where the lead locomotives were. All he rotaries back would be on the front end of their cars. Duh.
Now, if there was a Remote Unit in the Consist, or a Slave Car to actuate the remote power by radio, there would have to be a Double-Rotary coupled AHEAD of same, as units etc did not have Rotary Drawbars, as a rule. These cars were usually in a separate number series and had the Identifying mark on BOTH ends.
Same at Caboose end.
If Rotary DBs on opposite end, the Double Rotary car would have to be against the lead unit, and against the trailing end of Slaves. Caboose would be okay.
Special Instructions stated TWO Rotary D/Bs were NOT to be coupled together, as then they could both revolve and both become upside down…
Care had to be taken re these instructions, and at least One 1 Caboose was turned on it’s side at the Dumper as non Rotary car next ahead.
Instructions were then issued to have Cabooses UNMANNED as car ahead went into Dumpers.
Some Cabooses here had TWO 2 Train Line Angle Cock