News Wire: Metra asks STB to intervene in dispute with Amtrak in Chicago

CHICAGO — Metra is asking the Surface Transportation Board to resolve a disagreement between the commuter rail agency and Amtrak involving its lease and trackage rights at Chicago Union Station — a dispute that could have ramifications el…

http://trn.trains.com/news/news-wire/2018/04/10-metra-asks-stb-to-intervene-in-dispute-with-amtrak-in-chicago

What authority does the STB have over passenger trains? I assumed that authrity was curtailed after the ICC sunset act.