This is MWAA http://www.radioreference.com/apps/db/?sid=229 This is WMATA http://www.radioreference.com/apps/db/?sid=2721 Completely different bands and no shared frequencies. 868.2125 is the MWAA control channel. It is not licensed anywhere in Maryland. 496.4375 is the current WMATA control channel. There is no WMAA.