What material is the inner glass of a railcar typically made from?

The inner glass of a railcar is correctly identified as being typically made from Lexan, which is a brand name for a type of polycarbonate. Lexan is favored for its strong impact resistance and lightweight properties, which are particularly beneficial in the rail industry where safety and durability are paramount. Unlike conventional glass, Lexan can withstand significant forces without shattering, making it a suitable choice for environments that require both transparency and resilience.

While the other materials listed may have their own advantages, they do not combine the same level of safety, impact strength, and weight-saving characteristics that Lexan provides. Tempered glass, for instance, is designed to be stronger than standard glass but can shatter into sharp pieces upon impact, which poses a safety risk. Acrylic, while lightweight and shatter-resistant, does not have the same level of scratch resistance or structural integrity as Lexan. Therefore, Lexan's unique attributes make it the primary material for the inner glass of railcars, ensuring safe and effective operation within the vehicle.