  We characterize the properties of a new form of magneto-optical trap (MOT)
that relies on non-equilibrium population dynamics associated with
narrow-linewidth optical transitions. We demonstrate this mechanism using the
7.5 kHz linewidth transition in both bosonic and fermionic strontium isotopes.
In contrast to standard narrow-line MOTs based on imbalances in equilibrium
scattering rates, our system benefits from a less complex laser system, a
larger capture fraction from higher temperature samples, robustness against
experimental perturbations and the ability to operate in the presence of large
inhomogeneous broadening of the atomic transition frequency.
