Look at the image below. You have 25 seconds to study it, then 40 seconds to describe in detail what it shows.
Stages of Ballastless Slab Track Construction. Stage 1: Subgrade compaction and stabilising. Stage 2: Hydraulically bound base laying. Stage 3: Precast concrete slab positioning. Stage 4: Precision surveying and alignment. Stage 5: Self-compacting mortar injection. Stage 6: Rail fastening and tensioning.
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Look at the image below. You have 25 seconds to study it, then 40 seconds to describe in detail what it shows.
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Contact Wire Uplift by Operating Speed (millimetres). Standard Tension: 150 km/h 22, 200 km/h 31, 250 km/h 44, 300 km/h 62, 350 km/h 88, 400 km/h 125. High Tension: 150 km/h 18, 200 km/h 23, 250 km/h 30, 300 km/h 41, 350 km/h 56, 400 km/h 76.
| 150 km/h | 200 km/h | 250 km/h | 300 km/h | 350 km/h | 400 km/h | |
|---|---|---|---|---|---|---|
| Standard Tension | 22 | 31 | 44 | 62 | 88 | 125 |
| High Tension | 18 | 23 | 30 | 41 | 56 | 76 |
Acoustic Sources at 300 km/h (%). Wheel-rail rolling contact 42, Pantograph aerodynamic flow 26, Bogie cavity turbulence 18, Traction motor cooling fans 14.
| Category | Value (%) |
|---|---|
| Wheel-rail rolling contact | 42 |
| Pantograph aerodynamic flow | 26 |
| Bogie cavity turbulence | 18 |
| Traction motor cooling fans | 14 |
Energy Dissipation by Braking Subsystem. Columns: Initial Speed, Regenerative Electric, Eddy Current, Friction Disc. 350 km/h, 58%, 28%, 14%. 250 km/h, 66%, 19%, 15%. 150 km/h, 77%, 8%, 15%. 50 km/h, 84%, 0%, 16%.
| Initial Speed | Regenerative Electric | Eddy Current | Friction Disc |
|---|---|---|---|
| 350 km/h | 58% | 28% | 14% |
| 250 km/h | 66% | 19% | 15% |
| 150 km/h | 77% | 8% | 15% |
| 50 km/h | 84% | 0% | 16% |
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