On the NS lines between DC and New Orleans , the hemi duplex Channel Two (160.245/160.830) is being phased out.
This all division/everywhere dispatch channel two is being replaced with each division having its own unique, divisional channel two.
I am located near Spencer Yard in NC, and regularly heard NS dispatchers in Danville, Charlotte, Atlanta, and more rarely, PTC Support,
using remote bases at Spencer Yard, Salisbury, and Winston-Salem.
As they were talking, they were being carried on all three remote bases simultaneously.
ALL this radio traffic was funneled into one channel.
Because of the Hemi-Duplex nature of this channel two, dispatchers were not aware of others trying to talk on the same channel.
I often heard them mutually interfering with each other.
Train crews would have to say "repeat, again, again you got stepped on".
I think the reason for this was that the dispatchers and PTC Support people were hundreds of miles away, didn't have clear idea of what remote base served what area, so rather than trying to figure out which remote base served the area they were interested in, they would just turn on all the remote bases in an area.
Each division having its own unique channel two will mean more radio channels, consequently less interference, and dispatchers will not have to listen to radio traffic from areas they don't control.