Beginners Ask Trains What are those gray SPMX covered hoppers?

What are those gray SPMX covered hoppers?

By Steven Otte, Associate Editor | December 1, 2022

Part of a batch of 1,750 four-bay covered hoppers, they were built to carry plastic pellets from a Shell plant near Pittsburgh

A new light gray, four-bay, cylindrical covered hopper is seen in a rail yard

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