Keith Dysart wrote:
If such analysis is appropriate, then it seems
to me that a pulse can be viewed as a chunk of
charge moving down the line.
Q2. Is this an appropriate view?

No.

Q3. If so, then what happens when two such chunks
of charge collide in the middle of the line?

They don't "collide". Clouds of photons collide
and their behavior is well known.

Q5. If no charge crosses the mid-point, then how
do the pulses, made up of chunks of charge.
pass the mid-point?

How can two water waves pass through each other
while the water molecules are only moving up and
down?
--
73, Cecil http://www.w5dxp.com