“Dead Rails” can refer to a few different things, and each has a different “length”:

  • There is a CSI: Crime Scene Investigation episode titled “Dead Rails” with a runtime of about 42 minutes.
  • There is a Roblox game called Dead Rails , which is a long-form survival/train journey game; completing a full run can take several hours of real time depending on skill, mode, and whether you play solo or with others.
  • Within that Roblox game, the in‑game trip distance is on the order of hundreds of thousands of meters (for example, one full journey is described as about 880,000 meters to reach the cure), which translates to many hours of gameplay rather than a quick session.

If you tell me which one you mean (the CSI episode, the Roblox game “Dead Rails,” or something else with the same name), I can give a more precise length for that specific thing.