The growing need for efficient and sustainable electrified rail systems drives the development of advanced electric traction substations. Cryogenic and superconducting technologies offer a transformative approach to reduce energy losses and equipment size. This study investigates the feasibility of replacing conventional components in DC traction substations (transformers, diode rectifiers, and cables) with their cryogenic counterparts (superconducting transformers, cryogenic diode rectifiers, and superconducting cables). We discuss our ongoing efforts on developing and testing these components and present preliminary estimations demonstrating their potential to modernize railway electrification systems