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AAR Standard Railway Track Switch rail Turnout of Railroad Turnout System

AAR Standard Railway Track Switch rail Turnout of Railroad Turnout System

Product No.：202684165226
Price：nogotiation
Material：high-quality carbon steel
Standard：AAR or GB
mould charge：yes
Production time：60days
weight：200kgs/m
Package：pallents
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Product Description

The Railway Track Switch Rail and Turnout System is a critical infrastructure assembly that enables the safe and controlled diversion of rail vehicles from one track to another or to cross other tracks . Manufactured in compliance with AS 1085.21 (Railway track material – Part 21: Turnouts, switches and crossings), this system is designed for the safe and precise switching of tracks under demanding operational conditions .

A turnout consists of three main functional sections working in harmony: the switch rail device (which initiates the divergence), the intermediate rail part (which guides the transition), and the crossing with check rails and running rail (which completes the track intersection) . Each component must be precisely matched to ensure operational safety, as incorrect tolerances or inadequate materials have a direct impact on track reliability .

Key Components & Their Functions

Component	Function
Switch Blades / Tongue Rails	Movable, tapered rails that actively steer the wheel in the desired direction. One blade is always in contact with the adjacent stock rail to define the route .
Stock Rails	Fixed rails that serve as the reference surface and stop for the switch blade. They provide mechanical guidance and force absorption .
Frog / Crossing	The track component at the rail intersection that enables wheel flanges to pass from one rail to another. It bridges the "frog gap" using wing rails and wheel guides .
Closure Rails	Rails connecting the switch assembly to the frog, completing the turnout geometry .
Check Rails	Steel sections placed inside the running rail to guide wheel flanges through points and crossings .
Switch Roller Device	Supports switch blade mobility with low friction, reducing actuating forces and preventing jamming .
Slide Chair Plates	Bearing and guide surface for movable switch blades; anchored to sleepers to control movement .

Quick Specifications

Parameter	Specification
Applicable Standard	AS 1085.21 (Railway track material – Part 21: Turnouts, switches and crossings)
Switch Types	Simple turnout, curved turnout, double turnout, crossing, diamond crossing with slips
Rail Sections	53kg, 60kg, 68kg (as specified)
Gauge Compatibility	Standard Gauge (1435mm), Narrow Gauge (1067mm)
Available Turnout Radii	130m–1235m (for narrow gauge)
Turnout Speeds	Up to 80 km/h (depending on radius and rate)
Main Application	Mainline railways, heavy-haul freight corridors, mining transit, industrial sidings

Technical Data

1. Scope of Application

This document defines the technical requirements, design specifications, component functions, and dimensional tolerances for railway track turnouts, switches, and crossings manufactured in compliance with AS 1085.21 (Railway track material – Part 21: Turnouts, switches and crossings) .

The turnout system enables the safe diversion of rolling stock from one track to another or to cross other tracks. It covers the design and manufacture of all components, including switch assemblies, crossing units, and closure rails .

2. Applicable Standards & References

Standard	Subject
AS 1085.21:2020	Railway track material – Part 21: Turnouts, switches and crossings
AS 7642	Management of turnouts, switches and crossings (installation and maintenance phases)
RISSB Glossary	Definitions for railway industry terminology

3. Turnout Configuration Types

Configuration	Description
Simple Turnout	Single track diverging into two tracks
Curved Turnout	Turnout with curved geometry on both legs
Double Turnout	Single track diverging into three tracks
Crossing	Rails crossing at grade without switching function
Diamond Crossing with Slips	Diamond crossing with single or double slip capability
Scissor Crossover	Two turnouts arranged to cross over between parallel tracks

railway - track -rail - steel -turn -out

4. Component Definitions (per AS 1085.21)

Term	Definition
Turnout	A complete track assembly that allows rolling stock to converge or diverge into or from a single track
Switch Assembly	A track component that provides a path for a wheel to transfer from one track to another; consists of a section of bent and planed rail (switch rail) and its connecting parts (switch rod brackets, reinforcing bars, high strength tips)
Switchblade	A machined tapered rail that allows the direction of a train to be altered to another line
Stockrail	A length of rail providing support for the switch and acting as the running rail when the switch is open
Crossing	A track component that enables a wheel travelling along one rail to pass through the rail of a track which crosses its path
Closure Rails	Rails making up a turnout or special trackwork diamond configuration that are apart from those in the switch assemblies, crossings, and checkrail units
Check Rail	A steel section placed inside the running rail which comes into contact with the back of the wheel flange to guide the wheels through points and crossings

5. Track Geometry Parameters (Narrow Gauge 1067mm)

Radius (m)	Turnout Rate	Lead Length (mm)	Crossing Angle	Nominal Diverge Speed (km/h)
130	8.25	16,308	6.911°	25
200	10	20,205	5.711°	25
280	12	23,920	4.764°	40
500	16	31,960	3.576°	50
1,235	25	50,213	2.291°	80

6. Dimensional Tolerances (per AS 1085.21)

Component	Tolerance
Switch Blade Length	± 3 mm
Stock Rail Length	± 5 mm
Switch & Stock Rail Mating Surfaces	+0, +1 mm
Point Rail Length	± 3 mm
Check Rail Length	± 5 mm
Wing Rail Length	± 5 mm
Closure Rail Length	± 5 mm
Crossing Leg Length (to TPC)	± 3 mm
Crossing Overall Length	± 6 mm
Flangeway Width	+0, -2 mm
Running Surface Flatness	±1 mm over 2m length
Machined Surfaces	+0.5 mm