by west point
It becomes an item. Just replace , eliminate, overpass, or underpass most grade crossings. Great infrastructure projects. One thing do the work 24/7.
Moderators: GirlOnTheTrain, mtuandrew, Tadman
justalurker66 wrote: ↑Fri Nov 05, 2021 4:28 pm The recorded swing in Havre was 48 degrees on the day of the incident. I do not know what was forecast but there was no warning in effect.May have to be for a couple of days straight. I just make them stop and go but 40ish seems to be the number for temp swings. Then of course there is the continuous heat where temps exceed ??? Ive had heat orders in the 80s, 90s and 100+ degrees. Then again same situations and had none. Welded rail is a funky beast and the weather can make it do a lot of different things.
One week prior there was a 64 degree swing (28 at night to 92 in the daytime.
David Benton wrote: ↑Sat Nov 06, 2021 2:04 pm Pretty easy, the electrical resistance of steel changes with heat, so they could measure the resistance of a mile or so of track, and work out the temperature.I had to dig into this... but David's right. If you know the resistance of the rail at a set temperature, plus the temperature coefficent of resistivity (TCR) of the rail's composition, you can find the difference in temperature between set and actual (delta-T). The formula is (measured resistance) = (set/known resistance) * (1 + (TCR) * (delta-T).