Modeling Railway Control Systems in Promela

This paper presents an approach to systematically build Promela models with the aim of generating test cases within the system level testing process of railway control systems. The paper focuses on the encoding of the system model, of the aspects related to the representation of possible execution environments and their interaction with the system. The input for building a Promela model of the system under test is a state machine based specification. Indeed, state machines are one of the most common notations used in industrial settings to model critical systems and allow for easily obtaining the Promela model of the system by applying a well structured transformational approach; furthermore, state-based formalism are also highly recommended by CENELEC norms to model railway control systems.