Page 92 - 360.revista de Alta Velocidad - Nº 5

Michel Ruesen. Jaime Tamarit.

Just to mention some of the most significant projects in service based on SRS 2.3.0d

» France: Paris – Strasbourg - Mulhouse - Basel
» Italy: Torino – Milano – Padua and Milano – Roma – Napoli,

» Spain: Madrid – Lérida – Barcelona – Figueras (French border) and Madrid –
Valencia – Albacete - Alicante

» Switzerland: Mattstetten - Rothrist, Lötschberg Tunnel

» The Netherlands: High Speed Line South, Betuweline

» It must be underlined that some of these corridors have several
infrastructure suppliers and different ERTMS On-board suppliers. This
commercial experience is the confirmation of the railway interoperability
at commercial level.

4. Development of Baseline 3

Baseline 2 covers the needs for new (high-speed) lines; however, additional functionality is
needed for the conventional network, e.g. level crossings and shunting.
Conventional network puts high requirements on capacity, which Baseline 2 does not cover
like Braking curves, enhanced capacity of the radio link and additional functionality needed
for migration from class B to ERTMS (Level 1 Limited Supervision). Therefore, the European
Commission took a decision in 2008 to develop Baseline 3.
Baseline 3 not only contains all functionality of Baseline 2, but also tackles around 300 errors/
ambiguities of Baseline 2 and assures backwards compatibility, i.e. Baseline 3 trains can run on
Baseline 2 (2.3.0d) tracks.

Apart from the enhancement of Base line 2 with the cleaning process and the assurance of
the backwards compatibility, the Base line 3 incorporates new functionalities required for
deployment of the Trans – European Network, mainly:

» Level 1 Limited Supervision

» Level crossings
» Train categories
» Improved braking performance

» Packet switching technology for radio communication ➢ Online key management.

4.1 Evolution of Baseline 3

As stated before, the specification phase began in 2008 with SRS 3.0.0 and the first release
incorporated to the European Technical Specification of Interoperability of the Control Command
System (TSI CCS) was the release 3.3.0, incorporated in 2013.
A maintenance release of Base line 3 (SRS 3.4.0) was incorporated to the TSI in 2014, replacing

90 360.revista de alta velocidad