Chicago & Northwestern Railway Co. v. Michigan Public Utilities Commission

Plaintiff is a duly organized and incorporated railway company which is and has been for many years engaged as a common carrier operating its lines in Michigan, Wisconsin, Illinois and other States into which they extend carrying passengers and freight by rail, both in intra- and inter-state commerce. In 1921 the legislature of this State passed the so-called "cab curtain law" (Act No. 139, Pub. Acts 1921 [Comp. Laws Supp. 1922, § 8396 (24)]) entitled:

"An act requiring railroad companies to equip locomotive engines with either cab curtains or vestibule cabs, providing a penalty for the…