As I've noted before, I'm very fortunate to work in an office that overlooks a fairly busy NS line. Even more fortunate, if I'm not in a meeting or on a telcon I can usually record the cab numbers as the train passes by.
2014 is half over, and so far I've recorded 1050 different NS cab numbers! A fair number of BNSF, UP and CP locomotives too. #9900 (below, although captured at a different location) has shown up 5 times this year.
(Ya know, it's a less-than-thrilling job when the distraction and noise of a freight going by at 50 MPH actually becomes a welcome interruption...
)
Ron