IDOT D1 has been given a batch of 30 (or so) new STARCOM21 talkgroups in the 338xx range. Techs are reprogramming mobiles with these new TGs and testing them yard by yard, starting in southern D1. A reliable source says that each yard (including sign shops and ETP) and will have their own talkgroup. ETP's use of TG 1411 might be temporary until they get their 338xx TG. Eventually, D1 will switch over to the new SC21 TGs and the current P25 453 MHz repeaters will serve as backups.
I have been running Pro96Com on SC21 Site 102 for over a week now, and have noticed some D1 units that have been testing these new 338xx TGs have also affiliated with TGs 1420, 1421 and 1423. These are just above what was previously known as the highest IDOT TG in this range (1419, D3 Ashkum Yard). Unknown how these new 142x D1 TGs are being used. Data? Voice?
Hearing some of the new Talkgroups this morning on Site 102.