We introduce a model of transport of particles in a network, which is
represented by a connected graph with m vertices and n edges. Each edg
e represents a one-dimensional conductor of particles, whose behavior
is described by means of a linear Boltzmann-lilte equation. In graph v
ertices, a system of linear boundary conditions is given which takes i
nto account the exchanges of particles between the edges. The well-pos
edness of the initial value problem is studied into an abstract L(1)-l
ike setting and the structure of the solution is given for tile simple
st case of pure streaming transport.