const map<unsigned, Train *> &trains = server.layout.get_trains();
for(map<unsigned, Train *>::const_iterator i=trains.begin(); i!=trains.end(); ++i)
{
const map<unsigned, Train *> &trains = server.layout.get_trains();
for(map<unsigned, Train *>::const_iterator i=trains.begin(); i!=trains.end(); ++i)
{