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By year's end, about 90 percent of Union Pacific Railroad's locomotives will feature digital cameras. This year, the Class I plans to install more than 1,600 Track Image Recorders (TIRs) on locomotives to digitally record views of tracks, crossings and signals in front of a train.

The recordings help UP during investigations of pedestrian or grade crossing incidents and accidents. A video image disk can store up to five days worth of recordings.

The Class I mounts a small camera inside the locomotive cab and a microphone outside the cab to record the locomotive's air horn and bell.

The railroad began installing TIRs in 2005 and so far has equipped more than 4,000 locomotives, or 85 percent of the road fleet.