retb next generation - irse - irse presentation.pdf · 128136 - retb next generation 17-feb-16 1...

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128136 - RETB Next Generation

17-Feb-16 1

RETB Next Generation

Project Overview for IRSE Scotland, 16-Feb-2016 Gordon Pringle – Senior Project Engineer IP SNE

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Plan for evening

Background to RETB RETB – Operational Use RETB NG – equipment configuration Chain Establishment Sequence Trainborne equipment Migration TPWS Frequency Converter Audio Console / MSS Challenges Interesting at Points


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Background to RETB

Far North Signal Boxes in 1978 Clachnaharry (still open). Lentran Nth Muir of Ord Dingwall Sth Dingwall Nth

Garve Achnasheen Strathcarron Kyle of Lochalsh


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Invergordon Tain Bonar Bridge Lairg Rogart Brora Forsinard Georgemas Jcn

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January 1978 – Storm brings down 40-50 miles of pole route between Tain and Georgemas Temporary Train Staff and Ticket Working introduced between signal

boxes 1980 – Derby Research develop BICU to allow electric block between signal boxes via radio bearer Oct 1984 – RETB System developed and implemented on Kyle Line Dec 1985 – RETB extended to Far North (Wick/Thurso) 1986 – RETB implemented on East Suffolk 1987/88 – RETB implemented on West Highland Line July 1988 – RETB extended south from Dingwall to Inverness Rose St 1988 – RETB implemented on Cambrian 2006-2010 – renewal of Motorola NRN basestations 2011-present – RETB Next Generation

Radio Electronic Token Block

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Only two RETB systems in the United Kingdom West Highland Line Controlled by Banavie SC 180 route miles 2off interlockings

Banavie South Banavie North

Far North Controlled by Inverness SC 230 route miles 1off interlocking to be split in two by project

Radio Electronic Token Block

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GRIP 1-3 Development – Babcock Comms Design Ltd Park Signalling GRIP 4-8 Implementation Principal Contractor – telent Equipment Manufacturer – Comms Design Ltd Train Fitment – Multipulse Inverness SSI Alterations – Park Signalling

RETB NG – Project Delivery

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The purpose of this project is to provide a fit for purpose Signalling and Track-to-Train communications system in lieu of migration to ERTMS, FTN & GSM-R. The West Highland and Far North RETB systems currently operate in the Band III sub-band 2 (196-206MHz) frequency spectrum. OFCOM have stated that these frequencies will be reallocated in December 2015 as the frequencies are required for Digital TV throughout Europe.

► From Dec 15 Network Rail would be exposed to interference from Ireland and Norway

The RETB Next Generation equipment will operate on Band III sub-band 1 (177-191MHz)

Why renew the RETB Radio Bearer?

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Conventional Signalling Colour light signals Semaphore signals

RETB A token (electronically) is issued to a Cab Display Unit in the drivers

cab by the signaller, or in degraded mode card working Authority to proceed is given by the signaller to the driver verbally

RETB System operates on an ‘Open Radio Network’ where all users can hear one another

Authority to Proceed

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Typical Token Exchange Point (TEP)


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Up Line Down Line

Typical Station

TS2

TS1

TS2 TSS

TS1 TSS

Comprises the following: Fixed Distant board Point Set Indicator Stop Boards Train Operated Points TPWS Loop Clear

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TEP to TEP (Token Exchange Point) Types of Token Section Long Section Shunt Engineering

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Typical Token Exchange


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Up Line Down Line

Typical Station

TS2

TS1

TS2 TSS

TS1 TSS

Driver – 4321 at Typical Station standing clear of the single line Signaller – 4321 press and hold send Driver presses send (co-operative exchange, signaller enters command into Interlocking) Driver – 4321 I have blank display Signaller – 4321 press and hold receive for token exchange Driver – 4321 I have Typical – Next Token on display Signaller – 4321 You have permission to pass the stop board at Typical and proceed to the stop board

at Next Driver – 4321 I have permission to pass the stop board at Typical and to proceed to the stop board at

Next. Signaller – 4321 message confirmed Driver – 4321 Down Loop Clear Typical Signaller – 4321 message confirmed

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Crossing Move at Dalmally


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Up Line Down Line

Dalmally Station TS2

TS1

TS2 TSS

TS1 TSS

4103 arrives at Dalmally from Loch Awe/Oban Data exchange 4103 has given up the token in rear and is awaiting instruction

2271 arrives at Dalmally from Tyndrum Lower/Crianlarich Signaller instructs double exchange Double exchange doesn’t work (various possible causes) so forward token then issued 2271 has permission to proceed

Signaller instructs 4103 to press receive for forward token Token successfully exchanged and driver given authority to proceed 2271 confirms Down Loop Clear Dalmally 4103 confirms Up Loop Clear Dalmally

4103

2271

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What gets renewed

Fixed Radio Infrastructure ► Network Transceivers (base stations) – (80 transceivers over 46 sites) ► Antennas and feeders ► Power Supplies

Mobile Radio Infrastructure

► Trainborne NRN Radio ► Trainborne Cab Display Unit (CDU) ► Transportable Token Unit (TTU) ► Portable Handset (Brunel) ► Depot Test Unit (DTU) ► NRN radio and CDU replaced with Cab Display Radio – (approx 220 cabs)

TPWS – (38 locations)

► Frequency Converter required to allow TPWS to operate on new frequencies

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Inverness specific works

Replace faulty 110V Signalling UPS with 230V Site UPS Split RETB Interlocking to allow two signaller operation

Comms Design Limited

RETB Next Generation Fixed Site Equipment

• Main Cell Site • Repeater Site • Link Site • Multi-Repeater Site • Local Cell Site • Repeater/Local Cell Site

Fixed Site Equipment Overview

Fixed Site Equipment

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System elements

• Main Cell Site • Repeater Site • Link Site • Multi-Repeater Site • Local Cell Site • Repeater/Local Cell Site

• Cell Radio – Full duplex – provides lineside radio coverage • Link Radio – Half duplex – facilitates radio backbone bearer

4 additional Cell sites

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Antennas


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Dual band antenna with diplexor installed at certain sites to allow legacy and NG to share antenna system

Cell radios – 2-stack 2-dipole or 4 element yagi

Link radios – 5 element yagi and folded dipole

Glen Lochy 5-element Link to Dalmally 3 element legacy to Crianlarich Folded dipole NG Cell

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Driver 4103 sitting at Rannoch Driver Key’s system with PTT Radio Chain established from site to site Chain fully established – anything that driver 4103 says will be broadcast by every cell to all other users. Driver releases PTT and radio network tears down

Call Management

4103

4103 transmits Received by White Corries White Corries transmits what its receiving

Chain Establishment Sequence ≈ 30mS per link

Chain Tear Down ≈ 20mS per link

Comms Design RETB NG Train Equipment - Overview

Current RETB Equipment

CDU

Radio

Control Head

Comms Design RETB NG Train Equipment

CDR (Cab Display Radio)


Concept

Combines functions of CDU, Radio Control Head and Mobile Radio

CDR has same envelope as legacy CDU

Eases installation

Keeps driver familiarity


Familiar layout

Same controls as legacy CDU

Tamper-proof CDU Identification Number

Minimal user orientation

CDU


Compact radio controls

Clear graphic display with more information

Simplified driver operation

Control Head


Built into back of cab display unit

Space saving

Modern radio hardware

Mobile Radio


Machined aircraft-grade aluminium enclosure


Reverse printed overlays with EL illuminated legends incorporating hard display windows


Handset DAC Ltd 'Tuff'

handset

Highly reliable military design

Proven in rail installations

Different appearance to GSM-R handset

Right or Left handed PTT buttons on side of earpiece.


Handset Provenance

In use in NWR track-side telephones (RA708)

Installed in South West Trains Class 15x

Over 1000 in use daily in Tangara trains (Australia) installed by Siemens


Junction Box

Distribution of power, data & audio services

Screw terminal connections for easy installation

Compact, low profile unit


Antenna

Combined VHF & GPS Antenna

Same construction and dimensions as existing NRN antenna

Separate feeders for VHF and GPS signals


RETB NG On-train equipment diagram

H a n d s e t

N R N J u nction Box

RET B / N R NC h a n ge-ove r

Sw itc h

R o o fs p e a k e r

C a b l e A

C a b l e B

Cab

le C

Cab

le D

C a b l e E

C a b l e F

C a b l e G

C D R

Ca b l e #Co n s t r uct i o n E x a m p l e H & S p / nMa x . l e n g t h O / D ( m m )

A 5 x ( 2 x 0 . 5 ) 1 2 5 6 6 5 3 3 1 0 m 9 . 3B 2 x 2 . 5 1 2 5 5 6 7 9 4 1 0 m 6 . 6C 50RCo a x S X _ 0 4 1 7 2 _B- 6 0 1 0 m 5 . 5D 50RCo a x S X _ 0 4 1 7 2 _B- 6 0 1 0 m 5 . 5E 2 x 2 . 5 1 2 5 5 6 7 9 4 1 0 m 6 . 6F 4 x ( 2 x 0 . 5 ) 1 2 5 5 5 6 0 5 1 0 m 8 . 0G 2 x 0 . 5 1 2 5 5 6 7 5 6 1 0 m 4 . 0H 2 x 0 . 5 1 2 5 5 6 7 5 6 1 0 m 4 . 0J T B A T B A T B A T B A

C a b l e H

E x i s t i n g �Tra i nP S U

L e g a c yC D U

C a b l e J

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17-Feb-16 39

Auto tuning Why? User expectation that systems should require no manual

intervention. We thought that we could. How does it work? Every cell radio broadcasts a pip every 10 seconds. All radios (Cell, Link, CDR, TTU) have a GPS receiver that ensures

that pips are broadcast and listened for, at the exact same time. Signal strength is ranked for each system and channel CDR/TTU will auto tune when RSSI falls below specified value

Operational Change Driver must select the System/Signaller New signage to inform driver which system they should be selecting

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Migration Strategy


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Radio Control Rack

Audio Console

Legacy Network Deploy Parallel NG network for link testing Test Backbone from end to end Back cab testing to demonstrate RF coverage Connect Parallel network – confirm no legacy interference Back cab testing for Audio and Data

NG Test Audio

Console

Back cab tester CDR

CDR in front cab

CDU

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TPWS Frequency Converter


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Antennas and feeders renewed Some antennas re-aligned to

new Cell locations 12V TJ Transformer 2off Frequency Converters per

site Sites commissioned during day

between trains (hours at a time)

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Audio Console


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PC/Touchscreen Positive indication of BT link status Caller Identification Alarm Indications

Splitting & Combining

• Systems can be controlled combined (e.g. WHL N & S together), or split.

• Calls are made to, and received from, both parts of the system using both audio consoles when combined.

Comms Design Limited

RETB Next Generation Maintenance Support

System

Current Issues

Network Mimic

Site Health Graph

Base Health Graph

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Depot Test Unit


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Allows CDRs and TTUs to be tested off line

Can be fixed to antenna system and power (Corkerhill)

Portable (Queen St) allows fitter to replace CDR and undertake co-operative test by themselves

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Transportable Token Unit


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Allows engineers/track workers to take line blockage (Engineering Token)

6hr Battery (stops vehicle engines idling)

RS485Adaptor

Advanced Features Allows S&T to

access MSS functionality without attending site

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Any enhancements?

Multiple landline connections ► Make system more resilient to single site failures

Altered System Architecture ► Eliminating problem links

Additional Lineside coverage ► Modular solution of Cell and Link Radios allows supplementary

coverage to be provided at repeater sites • Spean Bridge, Corrour, Glen Lochy, Crianlarich, Inverannan,

Garelochead, Forsinard & Invergordon ► New sites at Connel, Mallaig, Balnacra Level Crossing and possibly

Kyle of Lochalsh ► Replaced White Corries REB

Auto tuning of train radio ► Easier for driver ► Reduced Lineside signage

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Far North

All radio and trainborne infrastructure renewed as per West Highland Line Far North Split

► Interlocking split into two at Invergordon ► Will allow capacity increase

• Although Rules of the Plan will require additional dwell time for all services at Invergordon

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RETB Next Generation equipment

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White Corries – new REB beside mast

Fairly harsh environment

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Connel – temporary install during construction

Mallaig – RETB NG antennas supporting both RETB and TPWS

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Challenges

Timescales to develop new products (from scratch) • Radio transceivers, Fixed Site Interface, Cab Display Radio, Audio

Console, Transportable Token Unit, Depot Test Unit, TPWS Frequency Converter & Hand portables

Parallel radio networks Train design and fitment Stakeholders – TOCs, FOCs, ASLEF, ORR, RSSB Geography Removing working CDUs from in service trains - scary Fixing legacy issues Audio Ramping Electrically noisy trains Questions?

Such a pleasurable experience working with people on West Highlands: Can do attitude Signallers and drivers on first name terms wishing one another a

good morning or good evening MOMs, signallers and S&T so helpful ScotRail very helpful

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Questions?

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System refinements (warts)

Pulpit Hill site abandoned Audio ramping Auto tuning algorithm tweaked to improve cell handovers Localised black spot identified on Up Taynuilt at 2-car stop board


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retb next generation - irse - irse presentation.pdf · 128136 - retb next generation 17-feb-16 1...

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