Track circuits are key signalling mechanisms that are responsible for the safe and smooth operation of a railway network but may be susceptible to geomagnetically induced currents caused by space weather. By utilising the Spherical Element Current Systems method of geomagnetic field interpolation, together with UK conductivity models to estimate geoelectric fields and railway network modelling, the impact of space weather on the UK railways can be investigated. Initial results from a UK-focused modelling project will be presented and next steps proposed.