GregR, I had a hard time hearing the sound and wondered if it was actually much louder to get over the sound of a passing train? As caveat, I am partially deaf especially at higher frequencies so please excuse if everyone with "20/20" ears hears it perfectly. 
As aside somewhat off topic but related, many years ago I had a chance to buy five sound boards and built a unit with four Noma station announcements plus a Marx one (Marx's was interesting sounding...). I could switch between any one and a button press played that announcement once. I bring it out when there is an open house and place speaker below the MTH station. BTW, my favorite Noma announcement is Pennsylvania (maybe because I grew up in Pittsburgh?), played it to death, and can still recite announcement verbatim (and still have station with original mechanism to boot.)
