Railway digital dispatch
Railway Digital Mobile Communication System
Railway Digital Signal Cable
high-speed railway digital signal cable
railway route selection；railway location；approximate railway location；location of railway route selection
Digital 8 tape Digital 8
Digital Archived Digital Publish
Digital In-Analog Out Digital Audio Equipment
digital province and digital city
Digital Radiography Digital Radiograph
Digital Selective Calling Digital Selective Calling
Digital Signal Level 0- Digital Signal Level 3 DS0-DS3
digital theater systems digital surround
Digital Video and Digital Audio
digital-analog-analog-digital
digital-to-digital data converter
the Interface Between Digital terminal and Digital Exchange
China Railway and German Railway