Crews have been working for a long time on the electric lines above the tracks, the power source for the trains.

WSJ: Probe begins after Conn. commuter trains crash

Mr. Melvin says he spends hours at the computer tracing power lines, looking for telltale shadows of electric towers or posts.

WSJ: Gulags, Nukes and a Water Slide: Citizen Spies Lift North Korea's Veil

It meant that we invested in infrastructure that would lay the groundwork for a 21st century economy -- not just roads and bridges but also broadband lines and a smart electric grid that could make us more energy efficient.

WHITEHOUSE: Discussing the Economy in Des Moines