Locomotive Night scene at a junction, Public domain image

New York City from 1835 to 1907 headed first by Nathaniel Currier, and later jointly with his partner James Merritt Ives. The prolific firm produced prints from paintings by fine artists as black and white lithographs that were hand-colored. The firm called itself "the Grand Central Depot for Cheap and Popular Prints" and advertised its lithographs as "colored engravings for the people". The firm adopted the name "Currier and Ives" in 1857.

Alois Senefelder, the inventor of lithography, introduced the subject of colored lithography in 1818. Printers in other countries, such as France and England, were also started producing color prints. The first American chromolithograph—a portrait of Reverend F. W. P. Greenwood—was created by William Sharp in 1840. Chromolithographs became so popular in American culture that the era has been labeled as "chromo civilization". During the Victorian times, chromolithographs populated children's and fine arts publications, as well as advertising art, in trade cards, labels, and posters. They were also used for advertisements, popular prints, and medical or scientific books.

The train station image dataset is picked from the world's largest public domain archive. Made in two steps - first, curated set, followed by running 25 Million public domain images through image recognition, it comprises more than 50,000 train station images from all countries and times. All images are in the public domain, so there are no restrictions on the dataset usage - educational, scientific, and commercial.