CEN TC256 – SC1 SeminarZAGREB 2012-10-12

Track Geometry ActivitiesWG28

2CEN TC256 – SC1 : 2012-10-12 Zagreb

TRACK GEOMETRY QUALITY – Summary

� Historical considerations

� Scope of WG28

� Work program of WG28

3CEN TC256 – SC1 : 2012-10-12 Zagreb

NEED OF A STANDARD ON TRACK GEOMETRY

� In early 90’s, the new processes of European Railwa ys needed a clear and common description of track geometry:� Interoperability

� Separation between infrastructure and train operator companies

� 3 CEN WGs requested a description of track geometry quality for their own works :� WG 7 Ride comfort for passengers� WG10 Vehicle acceptance

� WG 15 Track alignment design parameters

� Creation of a Survey Group in October 1994 (SG8)

4CEN TC256 – SC1 : 2012-10-12 Zagreb

WORK DONE BY SG 8

� SG8 Started in 1996: Review of how track geometry is handled by different activities (CEN, UIC, ERRI…)

� Survey of the current situation of track geometry by means of a questionnaire sent to each participating country to the SG :� Management of track geometry

� Track recording vehicles

� Relevant parameters� Processing and analysis of parameters

� Track geometry standards

� Correlation methods

5CEN TC256 – SC1 : 2012-10-12 Zagreb

CONCLUSIONS OF SG 8

� SG 8 gave 4 recommendations� Development of a rigorous method enabling measured data to be

compared when coming from two different systems� Establishing derailment standards for track geometry quality� Creation of an European Norm on track geometry quality

• Description of parameters and filtering methods (“strong agreement”)

• Track geometry standards values (“greater difficulty”)

� Creation of an European Norm on specification for future track recording vehicles

6CEN TC256 – SC1 : 2012-10-12 Zagreb

Scope of WG28

� Scope of the WG28 � To establish one or more European Standard covering the subjects:

• Characterization of the track geometry

• Specifications of measuring devices

� The WG 28 was created in 1998� the 1st meeting took place on the 8th of April 1998 in Bern� The 83rd meeting is scheduled on the 22nd of November 2012

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Program of work of WG28

� EN 13848 Series� WG 28 has worked on 3 main items:

� Characterisation of track geometry (Part 1)

� Measuring devices ⇒ This item has been divided in 3 parts:• Part 2: Recording vehicle

• Part 3: Track construction and maintenance machines• Part 4: Manual and light weight devices

� Geometric quality assessment• Part 5: Geometric quality levels

• Part 6: Characterization of track geometry quality

8CEN TC256 – SC1 : 2012-10-12 Zagreb

Members of WG28

� 25 members from 14 countries:� Austria

� Belgium

� Czech Republic

� Denmark� Finland

� France

� Germany� Italy

� Netherlands

� Portugal

� Spain� Sweden

� Switzerland

� United Kingdom

� Experts coming from:� Infrastructure Authorities

� Railway administration (including metros)

� Manufacturers of measuring systems

� Track works companies

� Vehicle manufacturer (one)

9CEN TC256 – SC1 : 2012-10-12 Zagreb

EN 13848-1 Characterization of track geometry

� Requirements to be respected by the track geometric parameters when they are measured by a recording device.

� 6 main parameters are described in the standard:� Gauge

� Longitudinal level� Cross level (or cant)

� Alignment

� Twist

� Each parameter is characterized by its:� Definition

� Measurement method� Wavelength range

� Resolution and Measurement uncertainty

� Range of measurement� Analysis method

� Output requirements

10CEN TC256 – SC1 : 2012-10-12 Zagreb

EN 13848-2: Measuring systems: Track recording vehicles

� Minimum requirements for measuring vehicles in orde r to produce comparable results

� General description of the requirements for a track recording vehicle� Measuring devices

� Data localisation

� Data processing

� Data output and storage

� Testing and validation of a recording vehicle� Calibration

� Validation by field tests� Repeatability and reproducibility tests

• Procedures• Values to be respected (Annex C)

• Statistical analysis of parameter data � 95th percentile• Statistical analysis of standard deviation• Frequency analysis (Transfer and coherence functions)

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EN 13848-3: Measuring systems: Track construction and maintenance machines (TCMM)

� Minimum requirements for measuring systems fitted o n track construction and maintenance machines

� General description of the requirements for the mea suring system� Same principle as EN13848-2

� Testing and validation of a system fitted on a TCMM� Calibration

� Validation by field tests� Repeatability and reproducibility tests

• Procedures• Values to be respected (Annex C)

• Statistical analysis of parameter data � 95th percentile

� Annex A� Parameters measured by TCMM and differences with EN13848-1 requirements

• Taking account of the specificities of maintenance machines

12CEN TC256 – SC1 : 2012-10-12 Zagreb

EN 13848-4: Measuring systems: Manual and light devices

� Minimum requirements for measuring systems fitted o n� track geometry measuring trolley (TGMT)

� manually operated devices (MOD)

� General description of the requirements for the mea suring system� Same principle as EN13848-2 / EN13848-3

� Testing and validation of a system fitted on a TCMM� Calibration

� Validation by field tests

� Repeatability and reproducibility tests• Procedures• Values to be respected (Annex C)

• Statistical analysis of parameter data � 95th percentile

� Annex A� Parameters measured by TGMT & MOD and differences with EN13848-1 requirements

• Taking account of the specificities of maintenance machines

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EN 13848-5: Geometric Quality level

� Safety levels required for the parameters defined i n EN 13848-1� This standard covers the following topics:

� Description of "quality levels" (AL, IL and IAL)� IAL: Immediate action limit for

• Longitudinal level• Alignment• Twist• Track gauge

� Considerations on other "quality levels" AL (Alert Limit) and IL (Intervention Limit)

• Annex B

� IAL are based on a survey of the current European p ractices in terms of safety limits

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EN 13848-5: IAL European survey

IALs are based on a survey of the European practices in terms of safety limits

0

5

10

15

20

25

30

35

40

40 80 120 160 200 225 250 300Speed (kph)

Val

ue (

mm

)

Network 1

Network 2

Network 3

Network 4

Network 5

Network 6

Network 7

Network 8

Network 9

Network 10

Network 11

Network 12

Network 13

Network 14

Network 15

Network 16

EN13848Pt5 IAL

EN14363 QN3

EN14363 QN3

EN 13848-5

Longitudinal

Level (IAL)

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prEN 13848-6: Characterisation of track geometry quality

� This standard covers the following topics:� Description of track geometry quality (state of the art);

� Classification of track quality according to track geometry parameters;� Considerations on how this classification can be used

� State of the art: methods for assessing track geome try quality� Standard Deviation� Isolated defects (counting)

� Combination of parameters• Combination of standard deviations• Standard deviation of combined parameters

� Point Mass Acceleration (PMA)

� Use of vehicle response• Calculated response with vehicle model and simulations (VRA method)• Use of direct measurement

� Use of power spectral density (PSD)

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prEN 13848-6: Track Quality Classes

� The track quality classes (TQC) are defined as stan dard deviation according� 5 speed ranges� For each speed range, 5 classes ranging from A (good) to E (poor)� For both longitudinal level and alignment

� The classes are based on actual European track qual ity evaluated by a survey of 13 Networks (length ca 60 000 km: 37% of the total)� Description of track geometry quality;� Classification of track quality according to track geometry parameters;� Considerations on how this classification can be used

� Possible application of TQCs� Key performance indicator for an infrastructure manager� Establishment of a detailed working plan by an infrastructure manager;� Acceptance of track works� Contractual purposes

• between Infrastructure manager and infrastructure owner• between train operator and infrastructure owner;

� Design of a vehicle by a manufacturer according to ride quality requirements� Vehicle acceptance (selection of track sections)

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Participating Networks (in alphabetic order*)

Austria ÖBB-InfrastructureBelgium InfrabelCzech Republic SŽDCDenmark Rail Net DenmarkFinland FTAFrance SNCF / RFFGermany DB Netz Italy RFINetherlands ProRailPortugal REFERSwitzerland SBBSweden TrafikverketUnited Kingdom NetworkRail

Data samples <5% not taken into account

European Track Quality Survey

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WG28 ETQS 90% σLL (13 networks)

0

1

2

3

4

5

6

v ≤ 80 80 < v ≤ 120 120 < v ≤ 160 160 < v ≤ 230 230 < v ≤ 300

1

2

3

4

5

6

7

8

9

10

11

12

13

E

QN2

network ID

km/h

mm

Longitudinal level: 90% percentile

19CEN TC256 – SC1 : 2012-10-12 Zagreb

WG28 ETQS σLL Europe (13 networks)

QN1

QN2

QN1

QN2

QN1

QN2

QN1

QN2

QN1

QN2

0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5LL [mm]

speed class 1: 230km/h < v ≤ 300km/hspeed class 2: 160km/h < v ≤ 230km/hspeed class 3: 120km/h < v ≤ 160km/hspeed class 4: 80km/h < v ≤ 120km/hspeed class 5: v ≤ 80km/hQN1QN2

Longitudinal levelCumulative frequency distributions of standard deviation

Network length represented: 160.000 km

Coverage: 37%

20CEN TC256 – SC1 : 2012-10-12 Zagreb

WG28 ETQS σAL Europe (13 networks)

QN1

QN2

QN1

QN2QN1

QN2

QN1

QN2

QN1

QN2

0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5

AL [mm]

speed class 1: 230km/h < v ≤ 300km/hspeed class 2: 160km/h < v ≤ 230km/hspeed class 3: 120km/h < v ≤ 160km/hspeed class 4: 80km/h < v ≤ 120km/hspeed class 5: v ≤ 80km/hQN1QN2

Network length represented: 160.000 km

Coverage: 37%

AlignmentCumulative frequency distributions of standard deviation

21CEN TC256 – SC1 : 2012-10-12 Zagreb

WG28: Future activities

� Revision of Part 5� Review of IAL value

� Carrying out a survey similar as Part 6 but dedicated to maximum values of isolated defects

� Taking account of speeds higher than 300 km/h

� Revision of Part 2

� Possibly, work on Urban Rail, with the help of expert s in that domain

22CEN TC256 – SC1 : 2012-10-12 Zagreb

THANK YOU FOR

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