ATCs

ATCs is an acronym used across several fields, referring to very different concepts in aviation, transportation, and the arts. This article provides a concise overview of the main uses of ATCs and how they function in their respective domains.

Air traffic controllers coordinate aircraft movements to maintain safe separation in airspace and on the ground. They work in control towers, approach and departure facilities, or en route centers, using radar or satellite data, radios, and data communications. Training typically combines formal education, certification, and ongoing proficiency checks, with standards set by national regulators and international bodies. The work is operationally demanding and emphasizes situational awareness, precise communication, and coordination with pilots and other controllers.

Automatic Train Control refers to systems that enforce compliance with speed limits and signals on rail networks. By automatically applying brakes or limiting acceleration, ATC improves safety and can increase track capacity. Modern implementations may integrate with signaling systems, timetable rules, and onboard cab equipment; configurations vary from legacy fixed-block protections to more advanced moving-block architectures. ATC systems are part of broader safety and signaling regimes and are often coordinated with railway traffic management systems.

Artist Trading Cards are small, collectible works created by artists and traded among participants. Standard size is 2.5 by 3.5 inches, with exchanges or “swaps” commonly organized by communities and online platforms. ATCs emphasize process, collaboration, and the spirit of exchange rather than commercialization. The practice supports experimentation across media and is accessible to beginners as well as experienced artists, fostering informal networks and inclusive participation.