Norfolk Southern Railway

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In this Thursday, Jan. 26, 2017, photo, a Norfolk Southern freight train hauling coal makes it way through downtown Pittsburgh. President Donald Trump's decision to withdraw the United States from the Paris climate accord may have only limited immediate impact on many U.S. companies, according to analysts. The American Coal Council said the climate accord “would put America at a competitive disadvantage and our nation’s abundant energy resources under lock and key.” The group said more than 90 percent of U.S. coal plants are equipped with advanced emissions controls, and that advances in technology will lead to further improvement. (AP Photo/Gene J. Puskar)

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In this Feb. 16, 2017 photo, a Norfolk Southern coal train running through Kermit, WV. While the major railroads operating in West Virginia have shed personnel and idled equipment in the coal industry's recent downturn, the railroads still operate across much of the state. (AP Photo/Michael Virtanen)

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FILE - In this Feb. 21, 2017 file photo, containers are unloaded from a rail car in the Norfolk Southern rail yard in Chicago. Chicago aldermen representing high-crime neighborhoods near a Norfolk Southern rail yard where thieves in recent years stole over 100 guns want new laws aimed at ensuring railways properly secure the facilities. An ordinance they recently introduced notes a "vice grip of gun violence" and contends city "train yards have emerged as a ready source of firearms." Among other things, it would mandate rail-yard fences be well maintained. (AP Photo/Charles Rex Arbogast, File)

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In this Tuesday, Feb. 21, 2017, photo, Pastor Corey Brooks of the New Beginnings Church poses for a portrait on a under maintained security wall that hugs the sprawling Norfolk Southern train yard and his church on Chicago's South Side. When street-gang thieves slipped with ease into a Norfolk Southern rail yard on Chicago’s South Side and ripped locks off one train, they likely expected to see merchandise like toys or tennis shoes. What they beheld instead was a gangster’s jackpot: box after box of brand new guns. (AP Photo/Charles Rex Arbogast)

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In this Tuesday, Feb. 21, 2017, photo, Pastor Corey Brooks of the New Beginnings Church poses for a portrait on a under maintained security wall that hugs the sprawling Norfolk Southern train yard and his church on Chicago's South Side. When street-gang thieves slipped with ease into a Norfolk Southern rail yard on Chicago’s South Side and ripped locks off one train, they likely expected to see merchandise like toys or tennis shoes. What they beheld instead was a gangster’s jackpot: box after box of brand new guns. (AP Photo/Charles Rex Arbogast)

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In this Tuesday, Feb. 21, 2017, photo, Pastor Corey Brooks of the New Beginnings Church poses for a portrait on a under maintained security wall that hugs the sprawling Norfolk Southern train yard and his church on Chicago's South Side. When street-gang thieves slipped into a Norfolk Southern rail yard on Chicago's South Side and ripped locks off one train, they likely expected to see merchandise like toys or tennis shoes. What they beheld instead was a gangster’s jackpot: box after box of brand new guns. (AP Photo/Charles Rex Arbogast)

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Work begins in clearing the track after a Norfolk Southern train carrying coal derailed near downtown Suffolk, Va., Saturday morning, Feb. 4, 2017. (Bill Tiernan/The Virginian-Pilot via AP)

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A workers for Norfolk Southern walks at the scene of a multi-car coal train derailment near downtown Suffolk, Va., Saturday morning, Feb. 4, 2017. (Bill Tiernan/The Virginian-Pilot via AP)