There’s a remote control option for use on ws19s with a reel. Junction Remote Control no.1 interfaced to a control unit on on the 19 set, and Junction Remote Control no.2 dangled on the other end if up-to a mile of cable.
Tank telphones used an aux connection into the drivers distribution box.
During wartime, a field mod used reels between some hq tanks so the rear-link tank could talk to the command tank directly, filtering messages to/from the two command nets on the A sets.
Different reels are used on Cent etc. which were there to enable comms between tanks without using the radio while laagered, again using the remote control box (IIRC).
I’m guessing it’s an extension of one of those purposes.
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