Which of the following progressive reforms mandated an 8 hour workday for railroad workers?

The Adamson Act was the progressive reform that mandated an 8 hour workday for railroad workers since these workers prior to such reforms often were up against very harsh conditions and long hours.  

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explanation:

first industrial revolution - the first wave of the industrial revolution lasted from the late 1700s to the mid-1800s. it industrialized the manufacture of textiles and began the move of production from homes to factories. steam power and the cotton gin played an important role in this period.