Why didn't the decision in the Munn v. Illonois case succeed in checking the power of the railroads?

Question

The Age of the Railroads

Answer 1

Because 10 years later, Wabash, St. Louis & Pacific Railroad Company v. Illinois severely limited the ability of the states to regulate interstate commerce.

Essentially, as soon as the states tried to regulate the railroads, they appealed on the grounds that they are, by nature, interstate commerce, instead of intrastate commerce, thus falling under federal scope instead of state scope.