AFTC5

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June 2, 2026
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KB Signaling, Inc.
A rack of six AFTC5 train control modules mounted side by side in an equipment cabinet. Each module features labeled indicator lights for track circuit and communication status, USB and Ethernet ports, application key slots, and a program connector. Several units have yellow and green LEDs illuminated. Red-handled circuit breakers are visible at the bottom of each module.

The AFTC5 is a jointless audio frequency track circuit that interfaces between interlocking systems and trackside equipment. It transmits and receives vital rate-coded carrier signals for train detection and delivers coded speed commands while also supporting bi-directional non-vital train-to-wayside communication. Ethernet connectivity removes the need for extensive discrete wiring. Designed for efficiency, it uses three lowest-level replaceable units to help reduce spare inventory and maintenance costs. Preventive maintenance can be carried out remotely from any PC connected to the signaling network.

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