  In this work the SMASH model is presented ("Simulating Many Accelerated
Strongly-Interacting Hadrons"), a next-generation hadronic transport approach,
which is designed to describe the non-equilibrium evolution of hadronic matter
in heavy-ion collisions. We discuss first dilepton spectra obtained with SMASH
in the few-GeV energy range of GSI/FAIR, where the dynamics of hadronic matter
is dominated by the production and decay of various resonance states. In
particular we show how electromagnetic transition form factors can emerge in a
transport picture under the hypothesis of vector-meson dominance.
