Who We Are


TINSA EOOD is a private limited liability Company (Ltd.) with one owner. The company was established with the main purpose to follow and apply European trends and requirements in the railway sector, based on the new approach to interoperability in the European Union.

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Notified Body

TINSA Ltd. is a Notified Body NB 2387 as per Directive (EU) 2016/797 of the Еuropean Parliament and of the Council of 11 May 2016 on the interoperability of the rail system within the European Union.

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Designated Body

TINSA Ltd. is a Designated Body with Permit №002-2, issued by the Minister of Transport, Information Technology and Communications of Republic of Bulgaria, for implementation of activities on conformity assessment of a subsystem or a part of it with the requirements of the national safety rules or the technical rules.

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Independent Safety Assessor

TINSA Ltd. is an accredited   Independent Safety Assessor, with Certificate of Accreditation № 9/ОСП, according to БДС EN ISO/IEC 17065:2012.

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Risk Assessment Body

TINSA Ltd. is a Risk Assessment Body, recognized with Certificate of Assessment Body for independent assessment of the suitability of both the application of the risk management process and of its results, according to Commission Implementing Regulation (EU) No 402/2013, issued by the Railway Administration Executive Agency and registered in ERADIS database with EIN number BG/36/0021/0001.

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Type A Inspection Body

TINSA Ltd. is an accredited type A Inspection Body, with Certificate of Accreditation №182 ОКА, according to BDS EN ISO/IEC 17020:2012, issued by the Bulgarian Accreditation Service Executive Agency.

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Testing of trackside and on-board ERTMS/ETCS equipment

TINSA Ltd. performs activities for laboratory measurement, testing and validation of parts and constituents of the ERTMS / ETCS equipment - part of the railway system.

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Latest news around TINSA

Laboratory accredited for Eurobalise testing

On 05.07.2022 an Intelligent Communication Infrastructures Laboratory, based in Sofia Tech Park, received Certificate of Accreditation according to standard... read more

Participation in a scientific conference on “Inspection and testing bodies in construction and maintenance of railway infrastructure”

On 10.06.2022, in the town of Sozopol, representatives of TINSA Ltd. participated in a scientific conference on "Inspection and... read more

Participation in an ERTMS 2022 Conference

From 26th to 28th of April 2022, eng. Denitsa Kireva-Mihova,PhD and eng. Marina Evtimova - expert-assessors of CCS subsystem,... read more

Member of a Bulgarian – Turkish Trade-Industrial Chamber

On 11.04.2022 TINSA Ltd. became a member of a Bulgarian - Turkish Trade-Industrial Chamber. read more

Ms Gergana Markova Karaalanova is re-electad as a Vice – Chairman of the NBRail Association

On 07.06.2021, at the Meeting of the General Assembly, Ms Gergana Markova Karaalanova was re-electad as a Vice -... read more

Independent assessment of the risk management process for Kostenec – Setemvri railway section and traction substation Belovo

On 24.02.2021, in the city of Sofia, between National Railway Infrastructure Company, in its capacity of an Employer, and... read more