The FAST® Loop

A cornerstone of the AAR’s Strategic Research Initiatives program, this purpose-built 2.8-mile track supports over 30 experiments annually, testing components under near-revenue conditions. By offering accelerated testing with heavier-than-standard freight cars, the FAST Loop supports impactful R&D that advances rail safety, efficiency, reliability, and sustainability.

  • Aerial of train on FAST Loop - Photo 1 of 5
  • Wider aerial of FAST® Loop, photograph 2 of 5
  • FAST Train on track, photograph 3 of 5
  • Closer look at consist on FAST® Loop, photograph 4 of 5
  • Aerial of train on FAST Loop, photograph 5 of 5

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The FAST® Loop is essential for advancing rail safety by allowing components to be rigorously tested before they are deployed in revenue service. This accelerated testing environment replicates real-world conditions, ensuring that new technologies and components are reliable and safe. The loop accumulates over 140 million gross tons of heavy axle load traffic per year, providing a robust platform for evaluating the durability and performance of rail infrastructure.

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