With the growth of wireless technologies at low cost, railway industries are leveraging wireless platform to create efficiencies. Indeed, the aim of the work presented in this paper is a part of a general study concerning the connected wagon. The objective is to ensure communication of data associated to wagon (contents, location…). The paper presents, firstly, a state of existing technologies and the most promising technology for our project: ZigBee. Then, the second part evaluates their performance in propagation environment taking into account channel propagation and coexistence between technologies in 2.4 GHz.