Pspice modeling of transmission line
For 1000 feet I calculated the inductance should be .0002 H and 14600 pF. I broke the model up into 4 segments. Each one with 14600 pf cap, and .0001 Henries on each wire.


If you broke it up into 4 segments, then each segment should have 3650 pF and 0.00005 H.

Despite what the other answer said, this is a perfectly reasonable way to solve this problem, and essentially the same as what Spice would do under the hood if it you used a Spice that had built-in transmission line models.


  How many segments is enough to break 4000 feet into? 10? 100?


The usual way to work this out is to first try 10, then 20. If the answer didn't change, then 20 is enough. If the answer changed, then keep increasing the number of segments until the results stop changing.