"Billions of dollars have been spent already and more is to come to deploy that system," he said.
Train wrecks keep U.S. on safety track for world's lowest fatality rate →
"The Europeans have a system which they call the European Train Control system. It's a multilayered system that's employed in some places but not in others. If it were fully deployed, some of their accidents would've been mitigated," he said.
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