Railroads serve two purposes, to move goods (including livestock) and to transport people. Passenger cars have been around since the early days of railroading, as it proved to be a faster and often safer way of traveling than other modes of transport. Cars were originally made out of wood, then a mixture of metal and wood, and today they are all made out of metal (mostly lightweight aluminum). There are three distinct phases of passenger cars, by which we have also cataloged our S-scale entries, namely "old time" which represents the early, shorter passenger cars from the Civil War era up until the early 1900s (this covers the narrow-gauge time-frame as well). As travel by rail became more of a norm, larger and more specialized cars were created in a phase typically referred to as heavyweights. These cars initially only provided ventilation through windows, but over time they were upgraded to have ice-based, and later mechanical, air-conditioning systems. By the 1930s the lightweight streamliner passenger cars were built by, among others, Pullman and Budd. These were sleek, modern-looking cars. After WWII Americans switched to preferring the much improved automobiles and with the creation of the interstate highway system throughout the country, travel by personal automobile became the norm. This, of course, led to a decline of rail passenger service, and so most passenger cars were last built from-new in the early 1950s. Due to the continuing decline of passenger revenue, American railroads were looking at shutting down the money-losing services, so in 1971 Amtrak (American Track) was created. It is funded by federal and state funding as well as by passenger fees. Its network covers most of the United States and also operates into Canada in Vancouver, B.C. and Montreal, ON. With the Amtrak era, due to open space in the U.S., the bi-level passenger cars were created, allowing for more people to fit in cars, or to offer more space per customer.

Below are links to the various reports that show all of the S-scale passenger cars ever produced. Click whichever report gets you to the information that wish to find, some of which are designed to help you identify passenger cars. The bottom of this page has additional references that might be of interest.
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These definitions may clarify some of the terms used in the reports linked to above:
In 2009, P-B-L did a one-time run of 1,008 Sn3 passenger cars, all brass, all built by Boo Rim in Korea, and all sold-out. When they arrived, they were so busy shipping them to their customers that they forgot to photograph at least one of each final model. So their web site shows only the pre-production photos. We show those, unless we have received photos from modelers (we always prefer to show modelers' photos; hint, hint).
Click the red header text for the external web site. The sentence below it provides a high-level description of what you will find on that web page.