A simulator in Union Pacific's Roseville yard demonstrates how a new GPS system called Positive Train Control will help engineers avoid crashes. Tony Bizjak The Sacramento Bee
A simulator in Union Pacific's Roseville yard demonstrates how a new GPS system called Positive Train Control will help engineers avoid crashes. Tony Bizjak The Sacramento Bee

New GPS technology will help keep trains from crashing. Why is it taking so long to arrive?

March 06, 2017 04:00 AM