With CBTC, we have gear on each trains and alongside the tracks (we name this “wayside”). Trains communicate with wayside tools that connects again by way of a private community to servers at our Rail Control Center. To make this a actuality, we’ve been changing our current signaling system with the worldwide gold commonplace of signaling techniques. Known as Communications-Based Train Control , our new signal techniques use wireless connectivity to maintain trains in constant contact with a centralized system that controls their movement. Legacy signifies that the system is outdated or wants substitute, however it may be in excellent working order so that the company or owner is not going to improve and prefers to still maintain it in use.