You MUST !
https://d6d0f649-a755-4b9e-a177-2fce53d7a544.filesusr.com/ugd/91bc32_ccb067507a31458d9d0ab8559478ce3a.pdf
FRA Emergency Order 32
* Wearing a mask while engaged in railroad operations is a Federal Law.
* Refusing to wear a mask is a violation of Federal Law, and could be subject to individual fines by FRA.
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signed by FRA Administrstor