Yep, the NS has RailView cameras in most of the widebodies. The microphone is outside to record the bell and horn. The camera is in sync with the event recorder. Some guys don't like them because they think the company is spying on them, but it has already saved my arse once. My train (I'm a conductor) hit a truck at a grade crossing, killed the driver.
The family and the trucking company filed a lawsuit against the NS, me and the engineer. The suit was dropped however, when the NS produced the recording. The video clearly demonstrated we did everything right. We were underspeed, blowing the horn and ringing the bell. The camera also clearly showed the crossing lights flashing. The event recorder shows the engineer and I throwing the train into emergency at almost the same instant.
In the end, the trucking company actually had to pay the NS for damages.
-r