Thank you for the reply. Is there a difference btwn the track speed limit, and normal traversal speed, ie, as a margin of safety does a train or schedule have trains travel somewhat below the speed limit? ... so when we picked up the hour btwn DEN and LNK, he was probably pushing right up against the limit, whereas the normal speed might have been somewhat slower? Likewise, I'm assuming GPS is used to report train locations back to OMA or wherever - is that how it would be found out he was over the limit?