Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The R40A was a New York City Subway car order built by St. Louis Car Company between 1968 and 1969. The order contained two forms: a slant-ended version that was similar to the original R40 order (sometimes referred to as the R40 Slant), and a straight-ended (or "modified") version similar to the R42 order (sometimes referred to as the R40M). Both nicknames were not official designations. The R40As were originally delivered with air conditioning units. As a result of the air conditioning, the standee poles were arranged in a diagonal pattern rather than the straight-line pattern seen in the R40. The slant-ended cars were numbered 4350–4449 (originally numbered as 4450–4549 until 1970) while the straight-ended cars were numbered 4450–4549 (originally 4250–4349, again until 1970).

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