If you haven't been to Chama or Antonito this year, 484 has a different whistle. The whistle on 484 for quite some time has been out of tune and hitting the high notes. The current whistle is courtesy of Ken, the current GM. The new whistle is from a B&O flat top and has a very pleasant sounding three chime.
484's whistle original whistle is safe and sound. It's so nice hearing a 3 chime whistle on the C&T.