Indiana Code Title 8. Utilities and Transportation § 8-9-12-2

(1) read and understand the timetables of the carrier that employs the railroad employee;

(2) read ordinary handwriting in the English language;

(3) speak, hear, and understand the English language;  and

(4) see, distinguish, and understand the signals required by the book of rules of the carrier governing the operation of the locomotives and trains of the carrier.

(1) Engineers.

(2) Conductors.

(3) Flagmen.

(4) Firemen, brakemen, or yard brakemen or helpers.

(5) Yard conductors or foremen.