Those frequencies for the NXDN traffic are all wrong.
A lot of it is for Rebel Communications, they have several licenses here in this area, but they all use the 3.125 kHz offsets (+ and -) so if you don't get the exact frequency all the way out to 6 decimal places you won't get a decent decode most of the time. And of course Nevada Ready Mix has their 800 MHz NXDN system as listed as well, but that's about everything I've picked up and logged for NXDN comms here in Las Vegas in the past few months. Doesn't mean new stuff won't appear, of course, 'cause it most likely will. Never seen it used for railroad traffic around here yet even in spite of it being popular for those purposes.
Stuff in the 460 range is either The D downtown (across the street from me, basically) or Luxor (which I'm sure I'm too far to get a signal from). The D has a lot of traffic at 463.621875 (-3.125 kHz) and 463.628125 (+3.125 kHz from the licensed frequency of 463.625 but they have others as well).
And for D-Star, DSD+ doesn't do audio decodes of that protocol, it just decodes any data stream meaning textual messages, etc. It's pretty rare to catch anything being used on that Ham frequency, D-Star just doesn't seem popular in our area at all. The custom v1.7 of DSD can do D-Star audio decodes, however.