Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The R9 was a New York City Subway car which was built in 1940 for the IND and its successors, which included the NYC Board of Transportation and the New York City Transit Authority. A total of 153 R9 cars were ordered from two different manufacturers. Cars 1650 - 1701 were built by American Car and Foundry, while cars 1702 - 1802 were built by Pressed Steel. 150 of the new cars were ordered for service on the new IND Sixth Avenue Line, which opened on December 15, 1940. The Sixth Avenue Line was the second IND Manhattan trunk line (joining the 1932 IND Eighth Avenue Line), and therefore the additional cars were needed for new service. The remaining 3 cars in the R9 contract were ordered as replacements for 3 older IND cars that had been damaged beyond repair as a result of a 1936 collision.

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