Gcrt5023 Iss 1

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Railway Group Standard

GC/RT5023

Issue One

Date September 1995

Track Standards

Manual - Section 1:

Basic Track

Category Matrix

Synopsis

This section of the Track Standards

Manual specifies the method of

categorising the track forming

Railtrack’s Infrastructure.

This document is the property of

Railtrack PLC. It shall not be

reproduced in whole or in partwithout the written permission of

the Controller, Safety Standards

Railtrack PLC.

Published by

Safety & Standards Directorate

Railtrack PLC

Floor 2 Fitzroy House

355 Euston Road

London NW1 3AG

©Copyright 1995 Railtrack PLC.

Signatures removed from electronic version

Submitted by

................................................................................................................

Nick Howland

Nominated Responsible Manager

Approved by

................................................................................................................

Tom Stevenson

Chairman, Civil Engineering Subject Committee

Authorised by

................................................................................................................

Matt Walter

Controller, Safety Standards

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GC/RT5023

Issue One

Date September 1995

Page 1 of 7

R A I L T R A C K 1

Track Standards Manual - Section 1:Basic Track Category Matrix

Contents

Section Description Page

Part A Issue record 2

Responsibilities and distribution 2

Implementation 2

Health and Safety Responsibilities 2

Supply 2

Part B

1 Purpose 3

2 Scope 3

3 Principles 3

4 Equivalent tonnage calculation 3

5 Basic Track Category Matrix 5

References 7

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GC/RT5023

Issue One

Date September 1995

Page 2 of 7

2 R A I L T R A C K


Part A

Issue record This standard will be updated when necessary by distribution of a complete

replacement.

Amended or additional parts of revised pages will be marked by a vertical

black line in the adjacent margin.

Issue Date Comments

1 Sept. 95 Original document

This standard forms part of GC/RM5600 ‘Track Standards Manual’.

Responsibilities and This standard shall be complied with by all persons who are responsible

distribution for the design, installation, inspection, or maintenance of the track on

Railtrack controlled infrastructure.

Implementation The provisions of this Railway Group Standard are mandatory and apply

from 6th April 1996.

Health and Railtrack PLC makes no warranties, express or implied, that compliance Safety Responsibilities with all or any of Railway Group Standards is sufficient on its own to ensure

safe systems of work or operation. Each user is reminded of its own

responsibilities to ensure health and safety at work and its individual duties

under health and safety legislation.

Supply Controlled and uncontrolled copies of this standard must be obtained from

the Catalogue Secretary, Safety & Standards Directorate, Railtrack PLC,

Floor 2, Fitzroy House, 355 Euston Road, LONDON NW1 3AG.

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GC/RT5023

Issue One

Date September 1995

Page 3 of 7

R A I L T R A C K 3


Part B

1 Purpose This standard specifies the method of categorising track, based on usage,

and thereby provides a method for applying the variations in track

requirements which other track standards may reference.

2 Scope The contents of this standard apply to all infrastructure controlled by

Railtrack.

3 Principles 3.1. As the mandatory requirements relating to design, maintenance,

renewal and inspection of the track vary according to usage and speed,

sections of track must be categorised such that the variations in therequirements can be correctly specified and applied.

3.2 For the purposes of safe interworking all parties must use the same

criteria to calculate the categories. This standard is referenced by the other

standards in the GC/RM5600 Track Standards Manual.

3.3. The categories to be used are based on speed and “Equivalent Million

Gross Tonnes Per Annum (EMGTPA). EMGTPA takes into account

variations in damage caused by normal traffic and the calculation for

EMGTPA is based on that specified in UIC leaflet 714 for Theoretical Traffic

Load.

3.4 The boundaries of the categories are based on historical and

experimental data and are described on a graph which has speed plotted

against EMGTPA.

4 Equivalent tonnage EMGTPA = Sp(Kp.Tp + Kt.Ttp) + Sf(Kf.Tf + Kt.Ttf) calculation

Where:

Tp = Tonnage of passenger vehicles hauled.

Tf = “ “ freight vehicles hauled.

Ttp = “ “ passenger tractive units.

Ttf = “ “ freight tractive units.

Note: Tonnages are Annual but based on mean daily values.

EMUs & DMUs to be considered as hauled passenger vehicles.

HST power cars to be considered as passenger tractive units.

Bogie load and wear coefficients:

Kp = 0.80 for DMUs * see note below

Kp = 1.00 for other passenger stock.

Kf = 1.15 where either:

all freight vehicles have axle loadings of less than 20.0T or

freight vehicle with axles loadings between 20.0T and

22.5T account for less than 50% of total freight traffic.

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Issue One

Date September 1995

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4 R A I L T R A C K



freight vehicles with axle loadings between 20.0T and22.5T account for between 50 and 75% of total freight

traffic or

freight vehicles with axle loadings of 22.5T or heavier

account for less than 50% of total freight traffic



account for more than 75% of total freight traffic or


account for more than 50% of total freight traffic

* Only the following DMU sets may be placed in this category:

101, 104, 108, 114, 115, 116, 117, 119, 121, 150, 151, 153, 154,

155, 156, 157, 158, 159, 165 and 166.

Speed coefficient, Sp or Sf.

Line Speed Value of Sp or Sf

Up to 40 mph 1.00

41 - 50 mph 1.10

51 - 75 mph 1.35**

76 - 100 mph 1.55

101 - 125 mph 1.60

126 - 140 mph 1.80

** A value of 1.20 may be used for freight traffic at 60 mph maximum.

Track Coefficient Kt.

Kt = 1.40

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Issue One

Date September 1995

Page 5 of 7

R A I L T R A C K 5


5 Basic Track Category

Matrix

Basic Matrix

0

50

100

150

0 5 10 15 20 25 30 35 40 45

EQUIVALENT TONNAGE

S P E E D - m p h

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Issue One

Date September 1995

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6 R A I L T R A C K


Track Categories

0

50

100

150

0 10 20 30 40 50 60

EQUIVALENT TONNAGE

S P E E D - m p h

Cat 1

Cat 4

Cat 2

Cat 3

Cat

5

Cat

6

The horizontal portions of the track category boundaries are based on the

maximum speeds of the principal traffic types; the curved portions of the

track category boundaries up to 25 equivalent gross million tonnes per

annum (EMGTPA) are based on current and past experience. Above 25

EMGTPA the curves have been extrapolated to reflect the anticipated track

damage for very heavily used lines.

The 6 basic track categories may be defined as follows:

Category 1: For high train speeds and high tonnage.

Category 2: From moderate to high train speeds and high

tonnage.

Category 3 For moderate train speeds and moderate to high

tonnage.

Category 4 For moderate train speeds and moderate tonnage

Category 5 For moderate train speed and low tonnage

Category 6 For low train speeds and low tonnage

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