- The R33 ML was a New York City Subway car built by St. Louis Car Company in 1962 and 1963. They were a "follow-up" or supplemental stock for the “A” Division’s R29s and closely resemble them.
- R33 a.k.a. R33-class airship: The R33 class of British rigid airships were built for the Royal Naval Air Service during the First World War, but were not completed until after the end of hostilities, by which time the RNAS had become part of the Royal Air Force. The lead ship, R33, went on to serve successfully for ten years and survived one of the most alarming and heroic incidents in airship history when she was torn from her mooring mast in a gale. She was called a "Pulham Pig" by the locals, as the blimps based there had been, and is immortalised in the village sign for Pulham St Mary. The only other airship in the class, R34, became the first aircraft to make an east to west crossing of the Atlantic Ocean in July 1919 and by the return flight, completed successfully the first two-way crossing, and was decommissioned two years later after being damaged during a storm. The crew nicknamed her "Tiny".
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