This paper describes a distributed service based on “train-to-earth” wireless communication, which is able to allow maintenance engineers to remotely monitor and update the configuration of the applications running inside a fleet of trains. It is a very useful tool that avoids engineers to move from their offices to trains for doing the maintenance tasks. This service is the result of five years of collaboration with a railway company in the north of Spain. Moreover, it represents the following step af-ter the implantation of an innovative "train-to-earth" communication architecture in this company. Today, both the communications architecture and this service are being tested within the installations of the railway company with successful results