The present invention relates to a modular fastening for track crossings comprising a lower plate (1), an upper plate (2) and an outer shoulder (3) at each end of the plates, attached by means of adhesive bonding, comprising means for anchoring the fastening on a surface (A). The upper plate (2) comprises a smooth central segment (2′) located between two grooved areas (2″) in correspondence with the ends of the upper plate (2). The present invention also comprises two inner shoulders (4) with lower grooves (4′) which can engage and fit into the grooved areas (2″) of the upper plate (2), where said inner shoulders (4) comprise means for housing and securing an elastic fastening clip (B) for fastening a railway rail (C).