Covers the classification of lines, overall track structure, rail and rail fastenings, sleepers and their fastenings, ballast specifications (profile, section, depth of cushion), formation classification requiring treatment, insulated joints, switch expansion joints, and track structure specifically on bridges.
Key Points
- Ballast specification (profile, section, depth of cushion) directly affects track stability and drainage.
- Insulated joints and switch expansion joints serve distinct functions — signalling isolation vs. thermal expansion management.
Content Status
Draft note, grounded in real official syllabus text found via research but not yet cross-checked against the primary RBE PDF directly. Treat as study-aid only until verified.