There are no IRT cars that have CBTC.
If need be, the R142/A will probably be fitted with it and who can't ignore that future IRT rolling stock will have it.
Even the R-142s are not cbtc ready.
How would cbtc help anything? Do you know what CBTC is? It's a technology that would allow trains to be closee to another but still maintain safe distances, much better than the current block system allows. This ultimately leads to more TPH.