title = "Railroad Signaling and Interlocking Logic"

content = """
Railroad signaling and interlocking systems are the primary means of ensuring
safe train separation and preventing conflicting movements at junctions and
crossings. These systems rely on fail-safe logic to control signals and
switches.

**Signal Indications:** Signals communicate movement authorities and speed
restrictions to train crews. A "clear" signal indicates that the track ahead is
unoccupied and that the train may proceed at maximum authorized speed.
"Approach" signals warn of a restrictive signal ahead, requiring the crew to
reduce speed. "Restricting" signals allow movement at a speed that permits
stopping within half the range of vision.

**Interlocking Logic:** Interlocking is a system of devices and logic that
prevents signals from displaying a "proceed" indication unless the switches are
properly aligned and the track is clear. It also prevents switches from being
moved while a train is occupying the interlocking limits. Dispatchers interact
with interlockings through the CTC system, requesting routes and monitoring
signal status.

**Fail-Safe Design:** All railroad signaling systems are designed to be
"fail-safe," meaning that any failure in the system will result in a
restrictive signal (e.g., a "red" or "stop" indication). This ensures that train
movements are halted or restricted if the system's integrity is compromised.
"""

version = "0.0.1"
