The railway signalling is a system used to control the traffic on the Railway and thereby prevent accidents. The railway signalling in Sweden is a safe system and not a single train passenger has died as a result of an accident since year 2010. However, as railway signalling has been developed nationally and has not always been compatible with each other, a problem has arisen when trains travel between countries. To enable a more compatible signalling system a standardized and digitized system called European Railway Traffic Management System (ERTMS) is now implemented in Europe. Trafikverket (TRV) is responsible for the implementation of ERTMS in Sweden and a ERTMS-programme is established. ERTMS is expected to med implemented in Sweden by 2035. To maintain a safe railway system in Sweden, the implementation of ERTMS need to be at least as safe as the current system. This can be ensured by following different requirements stated in standards regarding safety. The European standard EN 50129, "Railway applications - Communication, signalling and processing systems - Safety related electronic systems for signalling", is one of these standards. EN 50129 is updated from an old version to a new version. The purpose of this master thesis is to identify and analyse the effect of the update of the European standard EN 50129 on the implementation process of ERTMS. In addition, this study aims to suggest which actions need to be done at ERTMS-programme to implement the new version of the standard. To investigate this a qualitative method is used which involves a literature study, an analysis of the differences in the standard and semi-structured interviews with persons working at TRV. Theory about safety, safety management and the concept of Safety-I and Safety-II is used in order to analyse and discuss the safety management at ERTMS-programme regarding the update of EN 50129. The results in this study show that the new version contains some new requirements that need to be implemented in the safety work within the ERTMS-programme, for example IT-security and human factors. Furthermore, the new version also contains additional explanations of subjects which can be helpful in the daily safety work. However, the study also shows that the new version involve already known requirements to a great extent. Therefore, regarding these part, the effect of the update is small. The suggested necessary actions are partly about implement the identified new requirements but also about implementing a more proactive safety approach and share the knowledge about the new version.

Railway safety is an issue that is closely related to people. Hazards such as a collision between two trains can result in severe casualties, necessitating the utmost level of safety measures. Linear actuators control the direction of the train and are critical devices in train operation. Therefore, the safety requirements for linear actuators are high; several internationally accepted standards can help regulate the design of railways and specify safety standards. EN 50129 and EN 50126 are critical standards to follow. This thesis presents two motor controller designs that can be used in linear actuators with high safety quality. This thesis contains two designs, a basic design and an advanced design. The first part of the thesis is the basic design. The basic design is based on the full bridge structure and combines two out of two logic. After integrating metal-oxide-semiconductor field-effect transistors, gate drivers, and DC-DC converter, the basic design is presented following the safety integrated level 4 requirements of EN 50129. A fault tree analysis and a common cause failure analysis are added. The failure rate after fault tree analysis is 2E −14 . The second part of the thesis presents an advanced design based on the basic design and introduces an Automotive Safety Integrated Level D-compliant gate driver according to ISO 26262. It improves the previous design of the DC full bridge to have about 50 percent fewer components. Meanwhile, the advanced design also gives a supplement and refinement of the basic design to advance the possibility of practical application. Failure tree analysis failure mode effects, criticality analysis analysis, and availability argument are then carried out with the advanced design. According to fault tree analysis, the failure rate of the advanced design is 2E−14. / Järnvägssäkerhet är en fråga som är nära relaterad till människor. Faror som en kollision mellan två tåg kan resultera i allvarliga olyckor, vilket kräver högsta möjliga säkerhetsåtgärder. Linjära ställdon styr tågets riktning och är kritiska enheter i tågdrift. Därför är säkerhetskraven för linjära ställdon höga; flera internationellt accepterade standarder kan hjälpa till att reglera utformningen av järnvägar och specificera säkerhetsstandarder. EN 50129 och EN 50126 är kritiska standarder att följa. Denna avhandling presenterar två motorstyrningskonstruktioner som kan användas i linjära ställdon med hög säkerhetskvalitet. Detta examensarbete innehåller två designs, en grundläggande design och en avancerad design. Den första delen av examensarbetet är den grundläggande designen. Den grundläggande designen är baserad på hela brostrukturen och kombinerar två av två logik. Efter att ha integrerat metall-oxid-halvledarfälteffekttransistorer, gate-drivrutiner och DC-DC-omvandlare presenteras den grundläggande designen enligt de säkerhetsintegrerade nivå 4-kraven i EN 50129. En felträdsanalys och en analys av vanlig orsaksfel läggs till. Felfrekvensen efter felträdsanalys är 2E−14. Den andra delen av avhandlingen presenterar en avancerad design baserad på den grundläggande designen och introducerar en Automotive Safety Integrated Level D-kompatibel grinddrivare enligt ISO 26262. Den förbättrar den tidigare designen av DC-fullbryggan för att ha cirka 50 procent färre komponenter. Samtidigt ger den avancerade designen också ett komplement och förfining av den grundläggande designen för att främja möjligheten till praktisk tillämpning. Felträdanalys fellägeseffekter, analys av kritikalitet och tillgänglighetsargument utförs sedan med den avancerade designen. Enligt felträdsanalys är felfrekvensen för den avancerade designen 2E−14.