Communications between railway stations and railway network elements are vital for uninterrupted and safe operation of railways. The Megaplex-2100 and Megaplex-2104 are flexible modular multiplexers enabling integration of voice, ISDN, video, data, and LAN services over multiple E1/T1, Ethernet uplinks or n x 64 kbps links. Omnibus support provides instant multi-party voice communications between distant operators in a non-service-intrusive fashion.