I have been shooting video footage on the railroads now for a nearly a decade and I still find myself running across new things all the time.
Take for instance the two cabless units in this mixed manifest consist. The two units are the BNSF # 336 and BNSF #346. Best I can tell, I think these units are GP60B’s.
https://www.youtube.com/watch?v=F0v8WWRO3bQ
Here is another look at these BNSF units: