Note also that this all "experimental" at this point, and there's a non-zero chance that they'll be back on VHF a few times before the UHF switch is permanent. The system is based on a network of BDAs underground, and I've been reliably told it has coverage and interference issues that have not been fully shaken out.
Are the new UHF-T band and legacy VHF-railroad band channels linked/simulcast while this shake out takes place?
Also, what's being done to replace the legacy VHF-railroad band tactical channels (old F2, F4, F6, and F8)? Have the Transit Bureau units been folded into the Tac A thru Tac W matrix, and, if so, where? (You'd think Tac T)
Lastly, what steps, if any, are being taken to replace the old Transit Bureau Citywide (F9/F10) system?