Be sure to spend some time in Kingman Canyon. If you want to see some desert running, drive on old 66 between Lenwood and Victorville.
Cajon Pass is a must-see if you haven't been, especially Summit and 'Hill 582'. The latter may be an uphill hike if the road is bad.
Downtown Pomona doesn't see any BNSF traffic, but UP can be busy if the timing is right.