The advances in wireless communication technologies and the proliferation of mobile devices have enabled the realization of intelligent environments for people to com- nicate with each other, interact with information-processing devices, and receive a wide range of mobile wireless services through various types of networks and systems everywhere, anytime. This "Internet of Things" will dramatically modify our lives allowing progress in various domains such as health, security, and ITS (intelligent transportation systems). A key enabler of this pervasive and ubiquitous connectivity environment is the - vancement of software technology in various communication sectors, ranging from communication middleware and operating systems to networking protocols and app- cations. The international conference series on Mobile Wireless Middleware, Oper- ing Systems, and Applications (MOBILWARE) is dedicated to addressing emerging topics and challenges in various mobile wireless software-related areas. The scope of the conference includes the design, implementation, deployment, and evaluation of middleware, operating systems, and applications for computing and communications in mobile wireless systems. MOBILWARE 2009 was the second edition of this conference, which was made possible thanks to the sponsorship of ICST and Create-Net and most importantly the hard work of the TPC and reviewers.

This book constitutes the joint refereed proceedings of the 5th International Workshop on Communication Technologies for Vehicles/Trains, Nets4Cars 2013 and Nets4Trains 2013, held in Vilnius, Lithuania, in May 2013. The 12 full papers of the road track and 5 full papers of the rail track presented together with 3 invited talks were carefully reviewed and selected from 24 submissions. They address topics such as intra-vehicle, inter-vehicle and vehicle to infrastructure communications (protocols and standards), mobility and traffic models (models, methodologies, and techniques), testing, and applications.