When a 20 m rail is 20 m long? (Poll Closed)

  • At a rail temperature of 30°C.
    2%
    1 vote

     
  • At an ambient temperature of 25°C.
    5%
    2 votes

     
  • At a rail temperature of 20°C.
    2%
    1 vote

     
  • At a rail temperature of 15°C.
    17%
    7 votes

     
  • At a rail temperature of 10°C.
    2%
    1 vote

     
  • At a rail temperature of 0°C.
    5%
    2 votes

     
  • At a rail temperature of 50°F.
    2%
    1 vote

     
  • When that rail is installed on track, no matter what the installation temperature is.
    2%
    1 vote

     
  • At the stress free temperature.
    57%
    24 votes

     
  • Always, you joker! A 20 m rail is always 20 m long.
    5%
    2 votes

     
  • Never.
    0%
    0 votes

     

Posted 2 years.