MAAC,
After you remove your TMCC and you find out that you probably have an interfearence
problem, you might try adding some Lights along your track to help with your signal loss.
Start where you loose signal and test as you go along, regaining your signal loss by adding the lights. We have engineered in this manner on other large layouts and usually you can run both TMCC & DCS on larger layouts by engineering in this manner.
PCRR/Dave