⚠️ This is a long video—feel free to jump ahead to the sections that interest you most! 😊
After packing the basics of chaining into an 8-minute video, we heard your feedback! In this in-depth follow-up, we revisit the fundamentals of chaining, providing a detailed breakdown of the IRT’s line chains and chain zero.
📌 Note: B1 Chains aren’t covered due to length, but we’ll have a future video focused on track listings soon!
🔗 Watch the original video for an introduction to chaining:
Original Video
Chain Example (New York City Transit)
📏 100-Foot Chain Standard
• 100+50 (10,500 feet) represents the distance from chain zero (starting point of measurement).
• Signal plates reference chain locations to ensure safe and efficient operations.
📍 A Division Signal Plate: 1002 F
• Top Line:
• First 3 digits = Chain location (e.g., 100).
• Next digit = Track reference (e.g., 2).
• Bottom Line: Chain letter (e.g., F).
📍 B Division Signal Plate: F1 100
• Top Left: Chain letter.
• Top Right: Track number.
• Bottom: Chain location.
🎥 Watch our 101 video for signal plate visuals:
🔗 Chaining 101
📌 Video Chapters:
⏳ 00:00 – Introduction
📏 02:47 – What is a Chain? (Track alignment & location referencing)
📄 05:00 – Chains in Documentation & Construction (Real-world examples)
🔧 07:15 – Recreating a Chain (Virtual Route 5 setup)
🚇 11:52 – IRT Network Overview (Chaining in the IRT system)
🔚 28:18 – Closing & Future Topics
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