Hello, John Pfaff?? where are you? John Pfaff is on this list and works for WABCO, Westinghouse Air Brake, the inventor of the air brake (that was George Westinghouse, not John..) Chime in John! He knows all of the current industry and existing designs. I am aware of a design by WABCO that uses the Echelon LON part for an electro pneumatic solution. I am not sure whether they will proceed with it or not, in light of Motorola's unfortunate bailing out. (I'm glad.. I hate the LON). Chris Eddy Pioneer Microsystems, Inc.