Adding customized sound TO A BLUE BOX ATHEARN DIESEL Upgrade a classic to 21st century standards ... Looking through my locomotives for a potential DCC upgrade, an older “blue box” Athearn Fairbanks Morse H-24-66 Train Master [1] caught my attention. The locomotive had little run time, was unrepresented on my DCC roster, and looked like a good candidate. My upgrade plan was to MRHMAG.COM • TABLE OF CONTENTS • INDEX