Newest update video on YouTube in case you haven't seen it. The video has lots of good scenes, esp. crossing a trestle in GPT, and from atop Hwy 49 bridge @ Perkinston, MS. Most interesting is the radio traffic while negotiating the transition from G&SI (CN) to NS in Hattiesburn, MS. The person who shot the scenes kept his scanner clipped to the tripod of his video camera.
It is interesting NS Dispatch identify the diamond at HBG as "IC Interlocking" as CN took over IC in 1998. We suppose they used that 70 year old identification number rather than confuse Old Heads!
Video shot by CSXBOY187 and titled (HD) Chasing Amtrak AAPRCo Mississippian Special. Arron lists the Road Power, Whole Train Consist and Chase locations. Excellent video and the crew chat is very interesting.