  Weak values, obtained from weak measurements, attempt to describe the
properties of a quantum system as it evolves from an initial to a final state,
without practically altering this evolution. Trajectories can be defined from
weak measurements of the position, or inferred from weak values of the momentum
operator. The former can be connected to the asymptotic form of the Feynman
propagator and the latter to Bohmian trajectories. Employing a time-dependent
oscillator as a model, this work analyzes to what extent weak measurements can
shed light on the underlying dynamics of a quantum system expressed in terms of
trajectories, in particular by comparing the two approaches.
