There is described a peripheral post of railway field devices, comprising: a plurality of control modules operatively connected or connectable by electric cables to respective railway field devices; —a rack housing said plurality of control modules, wherein said rack comprises: —a wiring frame adapted to be permanently attached to a support surface or to an installation wall, comprising a front side and an opposite rear side and comprising on the rear side first connectors adapted to be electrically connected to end portions of said cables; —a support and containment frame of the modules adapted to house said modules and adapted to be coupled to the wiring frame by drawing said support and containment frame near the wiring frame from said front side so as to reach a coupling position.