HEY, it works!
A friend was gracious enough to loan me his digitrax system and I connected it my layout. As mentioned, previously, I set up one of the four DC blocks to be able to switch to DCC or DC. I put all the blocks to DCC and ran a DCC engine from one yard to the other a distance of 400' going through 12 different blocks. The whistle was blown often to test to see that the engine was receiving a signal along the full length of the railroad, through all blocks and at the end of blocks: all worked well
I'm guessing no problems due to all the wiring that was need for the PFM sound system.
The track is all hand laid so rail is in 3' lengths and a jumper wire is soldered between each length of rail. Plus more than one set of wires had to be run to each block to get the PFM chuffing to work effectively over the entire mainline.
I ran the engine into the yard, flipped the toggle to yard DC power and ran the engine to the roundhouse.
I haven't checked out the NCE system yet.
I like the digitrax with a knob for speed as that's what I've been using for 70 odd years. I run all steam (plus electric) so, for the most part, all I need is whistle and bell. I can control two engines easily with one remote. Just turn one of the two knobs and the remote, immediately, gives you control of that engine. Press the dial twice and it reverses direction and puts an arrow indicating direction.
The system is very easy to connect to the railroad: two wires from the power source into the main station and two more wires from the station to the tracks.
The engine tested was a BLI GN S-2. The engine automatically knows if the track is DC or DCC and runs accordingly.
I need to find out if engine receivers are also that sophisticated as I want to be able to run the engine into the roundhouse on DC power. Also, I want to be able to run the DCC engines on DC.
I've got way to many engines so it's not practical (also financial) to convert all of them. I'm figuring 10 or so converted to DCC having full sound functions.
Also, During operating sessions, railroaders may have engines but no layout and they can bring their engines over to run on the GNRW.