Where a material can plastically deform by more than one mechanism, the relative extent to which the various mechanisms operate often depends on the strain rate. Most metals plastically deform only by dislocation motion or possibly grain boundary sliding. However, some industrially-relevant materials also exhibit crystallographic twinning and martensitic transformations to accommodate an applied strain increment. Higher strain rates tend to favour twinning and phase transformations over dislocation motion, as does reduced temperature, but most attempts to study these phenomena with neutron diffraction have only examined the temperature effect.We propose the use of the shear compression specimen (SCS) design to achieve higher strain rates than are normally achieved with in-situ loading on ENGIN-X, to explicitly study the effect of strain rate on twin formation.