Key Questions to Ask When Ordering Uic60 Rail

beaulieu

• Member since
  December
• From: NW Wisconsin
• 3,857 posts

Posted by beaulieu on Wednesday, April 25, 6:18 PM

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 rjemery wrote:

What kind of standards exist for certain weight rails?  Given 136-lb rail, what kind of traffic can run over it, and at what speed?

Also, what dictates the choice of rail weight?  What not use heavier or lighter rails?

RJ, the specifications for rails are very detailed, and include detailed specs for the chemical make up of the steel used in rolling the rail, and every detail of the  cross-section  at all points on the rail. AREMA (American Railway Engineering and Maintenance of Way Assoc.) is the Professional Association which publishes recommended practice for all relevant parts of the railway, like the IEEE does for Electrical Engineering. AREMA has a committee that sets the standards for Rails, and for example a 136RE rail is rolled to an AREMA 136-lb Rail standard. Back in the 60's and earlier many railroads had their own favorite crossections, so for example a Pennsy 133 lb rail and a UP rail of the same weight would not be identical. Before the Schism Railroad Engineers were members of ASCE (American Society of Civil Engineers), and a committee of ASCE set the standards. 

The foot of the rail serves to anchor the rail to the ties and helps to prevent the rail from being rolled over by forces from the locomotives and railcars. The web functions as a micro or mini-bridge spanning the ties, a taller web section makes the rail stiffer and spreads the load of a train over more ties, ballast and roadbed. The head is the portion that the wheels roll on, its thickness determines how much can be worn away by the wheels rolling over it before the rail must be replaced. So the Railroad Engineer looks at the amount traffic the Operating Department wants to run over the track in a given time frame, consults his budget given to him by the cheap bastards in the financial department, uses up his vocabulary of 4 lettered words, and orders the best rails he can afford, using a mixture of "premium" rails on the tightest curves, and cheaper rail where the track is straight, using every trick he and his brother Engineers at AREMA have devised to balance the two opposing desires.

Speed is more determined by Track Geometry, than by rail size. The recent TGV world rail speed record was set on UIC60 (60kg per metre, about 121lb rail).

The most popular current rails are 136RE and 141RE, they have the same size foot and web, but the 141RE has more metal in the head, so more can be worn away before the rail must be replaced. As to why you choose either a lighter or heavier section of rail. Its always a question of money, how much to buy the rail, how much to install it, how much cost from the disruption to traffic caused by the act of replacing the rail. 141RE rail was developed by Engineers from the UP and BNSF on the AREMA rail committee looking for a rail to use on lines carrying heavy coal traffic out of the PRB. The cost of replacing the rail and disrupting traffic justified the cost of a better ($$$$$) rail. They weren't having problems with rails rolling (foot), or ballast and ties deteriorating too quickly (web), so the answer was to increase the amount of metal in the head to allow more wear and more grinding of the surface. The result was the 141HA rail (HA being the last initials of the two UP Engineers who devised it). In time after the 141HA rails proved themselves in service the 141HA section was approved by the AREMA rail committe and it became the 141RE (kind of like the Good Houskeeping seal for rails). 

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Type&#;Heavy Rail

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Standard&#;European Standard EN -1

Material&#;900A/

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UIC60 Rail is mainly used for heavy load railroad, a very hot railroad track for sale. In France and Germany, it is widely used in high-speed railways. UIC60 rail has the characteristics of good ductility, high fatigue strength, and moderate fracture toughness. Its good chemical property enhances the performance and keeps the railroad tracks in good condition to a certain extent. 

UIC60 rail is manufactured according to the rules set by the International Union of Railways. To be more specific, this type of rail uses the European Standard EN -1. This European standard is for railroad rails of 46 kg/m and greater weight for railroad tracks. Nine pearlitic steel grades, ranging in hardness from 200 HBW to 440 HBW, are specified, including none heat-treated none alloy steels, none heat-treated alloy steels, heat-treated none alloy steels, and heat-treated alloy steels.

UIC60 Rail Profile

UIC60 Dimensions

Head Width&#;72mm
Height&#;172mm
Base Width&#;150mm
Thickness of Web&#;16.5mm
Nominal Weight&#;60.21kg/m
Material&#;900A/
Length&#;12-25m

UIC60 chemical composition (elements in% of mass)

&#;CSiMnPSoutput0.72-0.740.23-0.271.10-1.160.014-0..005-0.011average0.730.251.140..006

UIC860/0 0.60-0.80 0.10-0.50 0.80-1.30 &#;0.040 &#;0.040

UIC60 Mechanical properties

UIC60Tensile strength(Mpa)Elongation (%)Output920-.0-15.0Average.8

UIC860/0 880- &#;10

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UIC860 Standard Specification

UIC860 StandardSizeDimensionWeight (kg/m)MaterialLength (m)Head (mm)Height (mm)BaseWebUIC.A/-25UIC.560.A/-25