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What is the difference between Runway Alignment Indicator Lights (RAIL) and Sequenced Flashing Lights (SFL)?

Both of them are same in terms of flashing light.

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  • $\begingroup$ From Wikipedia: "RAIL are similar to sequenced flashing lights, except that they end where the white approach light bars begin." $\endgroup$ – Sanchises Jun 6 '17 at 10:32
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SFL start at the decision bar. RAILs may not. The key differentiating factor is that RAILs extend beyond the centerline lights.

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  • $\begingroup$ Thank you for answer. In the other words,SFL is embedded in ALS, on the other hand RAIL is outside of ALS. Is it right? $\endgroup$ – Aviat Jun 6 '17 at 12:52
  • $\begingroup$ @Aviat Lol! "Hand rail" had me confused for a second. [forehead slap] $\endgroup$ – TomMcW Jun 6 '17 at 13:39
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    $\begingroup$ There are RAILs and REILs. Had a instrument student get dinged on that once. $\endgroup$ – mongo Jun 6 '17 at 14:19

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