Which pioneering transportation-retail innovation did the Pullman Company first introduce to American railways in the 1870s that revolutionized shopping for travelers?

Before the era of online shopping and same-day delivery, transportation innovations dramatically changed how people accessed retail goods. Railway systems in particular created one of the most significant retail revolutions in history. This trivia question explores how transportation and retail history intersected to transform commerce and consumer behavior in ways that still influence our shopping patterns today.

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The first railway mail-order catalogs allowing passengers to shop while traveling and have goods delivered to stations along their route
Dedicated 'shopping cars' with rotating merchant displays from major department stores attached to long-distance trains
Luxury dining cars that sold exclusive retail merchandise alongside meals, creating the first 'captive audience' retail environment
Station-based retail kiosks with telegraphic ordering systems allowing passengers to shop before boarding their train