1. Limited supervision
UIC Limited Supervision Workshop 18 October - 2011
Poul Froesig UIC ERTMS ETCS and ERTMS Regional project manager

2. Introduction, status and background for the LS mode
• 1999- SBB established a document describing a cost
optimized proposal (no can signal, not SIL 4 etc.)
• 2001 – A SBB, BAV, BLS project is initiated
• 2002 - UIC supports the development of this function
• Very close UIC and e.g. CFR co-operation on this function
• Concept for ETCS LS developed for CFR by UIC in order to meet
the EU ERTMS requirement for funding when renewing
interlocking in stations especially the big stations
• CFR wanted a long term flexible transition (LS, L1 and L 2)
• Strong lobbying from diff. parties to implement level 2
• 2002- 2007 - Several initial UIC meetings with CFR regarding
corridor IV and preparation of the CFR ERTMS implementation
plan in order to be able to obtain EU cohesion funds already
from 2007
2 UIC LS workshop 18/10 -2011 Poul Froesig

3. Introduction, status and background for the LS mode
• 2003 - Denmark (as EU Member) stressed in EU § 21
the importance of the LS functionality
• 2004 - Bucharest Timisoara meeting with CFR before
the UIC LS workshop
• 2004 - The important Frankfurt meeting DB, SBB ,UIC,
CFR, Siemens CH
• 2004 - Final agreement in AEIF (London CCB
meeting) that LS is recognized to be included in the
next baseline
• 2005 - UIC Skeleton used for the CFR ERTMS
implementation plan
• 2005 - UIC elaborated FRS 4.50 (LS page 69)
• The UIC LS FRS introduced in the AEIF CR (DB/SBB)
3 UIC LS workshop 18/10 -2011 Poul Froesig

4. Introduction, status and background for the LS mode
• 2006 - UIC ERTMS Bern seminar. SBB put LS in focus as a
main item
• 2010 - ERA SRS 26.4 version 3.1.0. (section 4.4.19 page 36)
• 2010 - Open cab day at SBB (in February 2010) Prototype
presentation and test run of the LS concept
• Tests and discussions ongoing at DB
So looking back
• CFR were very active together with UIC in this initial period
from 2002 until 2008 in central Europe corridor activities
• SBB in parallel was very active in making the LS attractive for
the industry introducing LS in contracts, pilots etc.
4 UIC LS workshop 18/10 -2011 Poul Froesig

5. Basic functionality of the LS from the UIC FRS 4.50
Chapter 4.4.6 (Status 2005)
ETCS Limited Supervision Operation (LS)
• 4.4.6.1 LS shall allow technical interoperability of
ERTMS/ETCS equipped vehicles operating on
dedicated ERTMS/ETCS infrastructure (F)
• 4.4.6.2 LS shall be able to replace certain National
systems with equivalent functionality at least at the
same safety level (F)
• 4.4.6.3 It shall be possible to provide LS at certain
locations without the request for linking balises,
provided this meets the safety targets mentioned in
paragraph (F)
5 UIC LS workshop 18/10 -2011 Poul Froesig

6. Basic functionality of the LS from the UIC FRS
• 4.4.6.4 The maximum speed for LS shall be a
National Value (F)
• 4.4.6.5 LS requires the operation with emergency
braking curve only (F)
• 4.4.6.6 The on-board shall be capable to perform a
transition from Full Supervision operation, any other
Partial Supervision operation and from National
operation to LS when requested from track-side (F)
• 4.4.6.7 The on-board shall be capable to perform a
transition from LS to Full Supervision operation, any
other Partial Supervision operation, ……….etc. (F)
6 UIC LS workshop 18/10 -2011 Poul Froesig

7. Basic functionality of the LS from the UIC FRS
• 4.4.6.8 Before switching to LS, the on-board shall request the
driver to acknowledge the transition (F)
• 4.4.6.14 When passing a stop signal the on-board shall perform
a train trip (F)
• 4.4.6.15 The release speed shall be indicated to the driver (F)
• 4.4.6.18 Limited Supervision operation shall be permanently
indicated to the driver with a specific icon (F).
• 4.4.6.21 Even when all data for calculating braking curves are
available and supervised, the indication to the driver shall be the
icon for LS (F)
• Icon and text messages to be defined by the operational rules
group
7 UIC LS workshop 18/10 -2011 Poul Froesig

8. Restart of the LS development in Central
Europe
• October 2010 CFR, SZ asked UIC for a support of the
LS considerations
• Meeting held November 2010 where a strategy for the
transition from Indusi (I 60) towards LS were
discussed
• UIC developed a proposal for a strategy and activities
to be performed (January 2011)
8 UIC LS workshop 18/10 -2011 Poul Froesig

9. Basic content of the strategy for Central Europe
• Mapping of the Indusi functionality and the signaling
aspects
• Existing signaling interface to Indusi also a (R) for new
interlockings
• ETCS braking algorithms and the K factors to be defined
• No changes in the existing signaling and distance and
related aspects
• No linking in the typical LS application between the ETCS
balises
• Investigation on a Romanian and Slovenian station and lines
sections
• Comparison with the German LS test line near Berlin (PZB)
• Agreement of the LS concept in other central European
countries
• The LS concept to be introduced where?
• A unified LS concept for the region possible?
9 UIC LS workshop 18/10 -2011 Poul Froesig

10. Optimising costs
• Cost estimates and comparison between FS and LS supervision
1. The engineering costs (preprogrammed balises and future unified LEU’s)
2. The maintenance costs
3. The installations costs
4. Benefits of having a standard implementation of a TSI compliant ETCS
5. The homologation and certification costs
• Presentation at national level of the LS concept and its possible
implementation (organizations at national level, i.e. authorities,
drivers, unions, the operational departments, ministries etc.
• Acceptance of LS at a national level.
• Involvement of DG Regio
• Operational test of the LS concept in a pilot (Baseline 3 onboard needed)
2013
• Implementations plans to be actualized for the next EU budget phase
• Implementation level 1, level 2, LS or ERTMS Regional
10 UIC LS workshop 18/10 -2011 Poul Froesig

11. 11 UIC LS workshop 18/10 -2011 Poul Froesig
Thank you for your kind attention
Poul Froesig UIC ETCS and ERTMS Regional project manager
E mail:Frosig@mail.dk
Phone +4527104364
manager C ERTMS ETCS and ERTMS Regional project manager