In the article marked "AAR COMMITTEE SETS MID-2010 DEADLINE FOR RAIL INDUSTRY'S NARROWBAND CONVERSION " the article states that railroads "must be equipped with radios capable of transmitting at 12.5 KHz" and no longer at 25 KHz. Since 25 KHz is allocated to Fixed transmitters and 12.5 KHz is allocated to radionavigation, am I to assume this is talking about the bandwidth and not the transmit frequency, as the article suggests? If this is the case, then this change does not make any sense, when the AAR channels are already spaced at 15 KHz (with the exception of a few channels). Wouldn't this make radios operating with 25 KHz of bandwidth incompatible with AAR regulations in the first place?. Can anyone shed some light on this subject for me? Thanks.