more about rail fastening system

Jan 13, 2017

typical rail fastening system

Function of rail fastening system

A rail fastening system is the whole set fasteners that are used to join the rails and railroad ties (or other type of rail foundation). Normally, rail fastening system is consist of rail spike, rail bolt, rail clip, tie plate, rail pad and plastic dowel, etc. Rail fastening system is also known as an intermediate coupling part. On the whole, railway fastening system plays a role in fixing rails to the sleepers, maintaining the gauge and preventing longitudinal and lateral movement of the rail relative to the sleeper.

History of rail fastening system

  • In the earliest day, rail fastener means peg or nail that is used to fix wooden rail to wooden railway sleeper.
  • By the 18th century, cast iron railways had put into application, which is easy to be fixed by the railway fasteners. At the same time, the first rail chair was applied in the railway in 1797.
  • In the 1830s, the flanged’ tee’ rail was invented by Robert L. Stevens. This kind of rail is actually a distorted I beam, and it needn’t a chair.
  • Finally, flanged T railway become popular in the world, which require the rail fastening system to support.

Features of rail fastening system

railway fastening system

According to the requirement of railway track transportation, rail fastening system should have the following characteristics:

  1. With sufficient strength and durability
  2. With adjustability of gauge and horizontal
  3. With good insulation properties
  4. With good damping elasticity
  5. With compatibility and interchangeability

Types of rail fastening system

For different applications, railway fastening system can be divided into various types. Each type of rail fastening system has its components, which is different with other types. Rail fastening system is typically named after the types of rail clip, such as skl rail fastening system, e-clip rail fastening system, kpo rail fastening system, nabla rail fastening system, etc.

SKL clip rail fastening system

skl rail clip fastening system

Generally, the components of SKL rail fastening system include SKL tension clip, screw spike, flat washer, plastic dowel, guide plate and rail pad. Skl rail fastening system is used with concrete sleepers.
 

Part Name Type Material Surface Remark
SKL tension clip Dia. 13mm 60Si2CrA, 38Si7

Plain oiled,

color painting, or the other required ones.

Hardness: 42-47HRC
Fatigue test: When the clip spring deflection reaches 9.1mm and the swing deflection is 1.42mm, the fatigue life will be 5 millions cycles without breaking.
Standard: DIN17221, GB/T1222
screw spike M24*150MM
M24*160MM
M24*180MM
Grade 4.6: Q235
Grade 5.6: 35#
Grade 8.8: 45#

Plain oiled, black oxide, galvanized,

hot dip galvanized, Dacromet and sherardized

Standard: ISO898-1, UIC864-1 and NF F500-50
plain washer UIs7 Q235

Plain oiled, black oxide, galvanized,

hot dip galvanized, Dacromet and sherardized

Standard: EN10025, EN10139
plastic dowel For different size of screw spike HDPE, Reinforced Nylon 66 (PA66) Black, blue, yellow, green or other color For insert into concrete sleeper
guide plate UIC54, UIC60, 50kg rail, 6kg rail, and other sizes as ordered Reinforced Nylon 66 (PA66) Black, blue, yellow, green or other color Different designs are available.
rail pad UIC54, UIC60 and sizes as ordered EVA, or rubber Black, blue, yellow, green or other color Different designs are available.

E-clip rail fastening

e-clip rail fastening system

For E-clip fastening system, E-clip, shoulder, rail pad, insulator are necessary parts.

Part Name Type Material Surface Remark
E clip

Dia. 16mm

Dia. 18mm

Dia. 20mm

60Si2MnA, 

60Si2CrA,55SiMn

Plain oiled, 

color painting, 

or the other 

custom finish.

Hardness: 44-48HRC
Toe Load: 500-700kgf for Dia.16mm
750-900kgf for Dia.18mm
1100-1400kgf for Dia.20mm
Fatigue life:3 millions cycles 

without breaking for Dia.18mm, 

5 millions cycles without breaking 

for Dia.20mm
Standard: DIN17221, BS970, 

GB/T1222

Shoulder

UIC54,UIC60, 

115RE,50kg rail, 

60kg rail,BS80lbs,

BS100lbs

QT500-7 

QT450-10

Plain oiled, 

color painting 

Different designs are available. 
Rail pad 

UIC54,UIC60, 

BS80lbs,BS100lbs, 

in ordered size

HDPE, EVA, 

or rubber

Black or other colors

Different designs are available. 
Insulator

UIC54,UIC60, 

50kg rail, 60kg rail,

BS80lbs,BS100lbs, 

and size as ordered

Reinforced 

Nylon 66 (PA66)

Black, blue, yellow, green or other color Different designs are available. 

KPO clip rail fastening system

kpo rail clip fastening system

KPO rail fastening system is usually consist of KPO clips, screw spikes, HS bolts, Hex nuts and double coil spring washer.

Part name

Type

Material

Surface

Remark

KPO clip

KPO3, KPO6, KPO9

Q235

Plain oiled

Standard: DIN5906

HS bolt

HS26, HS32

Grade4.6: Q235
Grade5.6: 35#
Grade8.8: 45#

Plain oiled, black oxide, galvanized, hot dip galvanized

Diameter: 22mm or 24mm.
Length: 55mm, 65mm, 75mm, 90mm
Standard: UIC864-2

Hex nut

As ordered

Grade 5: 35#
Grade 8: 45#

Plain oiled, black oxide, galvanized, hot dip galvanized

Standard: DIN985

Double coil spring washer

As ordered

65Mn

Plain oiled, black oxide, galvanized, hot dip galvanized

Standard: UIC864-3

screw spike

M24×150mm
M24 ×160mm
M24 ×180mm
other length

Grade 4.6: Q235
Grade 5.6: 35#
Grade 8.8: 45#

Plain oiled, black oxide, galvanized, hot dip galvanized, Dacromet and sherardized.

Standard: ISO898-1,

UIC864-1

NF F500-50

Base plate

UIC54,UIC60, 50kg rail, 60kg rail,S49 in ordered size

Casting iron QT500-7, QT450-10, or forging low carbon steel or high carbon steel

Plain oiled

Standard: UIC864-6

Nabla clip rail fastening system

nabla rail clip fastening system
 

Structurally, a Nabla clip rail fastening system contains these parts like nabla clips, insulator, double end screw spike, special spring washer, hex nut and plain washer.

Part name 

Type

Material 

Surface 

Remark

Nabla clip

Thickness 4mm

 or 4.5mm

60Si2MnA, 

60Si2CrA

Plain oiled, 

red color painting,

 or the other required 

by customers 

Hardness: 42-47HRCFatigue 
life: 3 millions cycles 

without breaking 
Standard: DIN17221, 

GB/T1222

Insulator

UIC54, UIC60, 

S49 rails 

Reinforced 

Nylon 66 (PA66)

Black, blue, yellow,

 green or other colors

Different designs 

are available. 

Double end 

screw spike

UIC54, UIC60, 

50kg rail, 60kg rail

Grade 5.6: 35#

Plain oiled, black oxide, 

galvanized, 

hot dip galvanized

Bending at 30 degree 

without crack. 

Special spring

 washer

18.25×34×78mm

ML08Al

Plain oiled, black oxide, 

galvanized, 

hot dip galvanized

For protecting the thread of

 the double end screw spike

Hex nut

As ordered

Grade 5: 35#

Plain oiled, black oxide, 

galvanized, 

hot dip galvanized

Standard: DIN985

Plain washer

As ordered

Q235

Plain oiled, black oxide, 

galvanized, 

hot dip galvanized

Standard: DIN125


In conclusion, rail fastening system should be able to maintain the reliable connection between rail and railway sleeper effectively over a long period of time. Under the dynamic action, railway fastening system must give full play to its damping and the buffer performance. Besides typical types of railway fastening system mentioned above, there are many other kind of rail fastening system on the market, including high speed WJ series rail fastening system, type IV rail fastening system, fast clip rail fastening system and SFC fastening system etc.


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