Installation of railway turnouts during major possession windows. Analysis based on standard 48-72 hour possession periods with continuous working shifts. Production rates vary based on turnout size, track speed, and installation methodology.
Key Statistics:
- Standard possession: 48-72 hours
- Typical sizes: 1:8 to 1:24
- Track speed: 40-200 km/h
- Installation window: 36-60 hours
- Testing period: 6-8 hours
- Handback: Speed restricted
- Team size: 25-35 workers
- Critical tolerances: ±2mm
TURNOUT SPECIFICATIONS BY TYPE
HIGH-SPEED TURNOUTS (>160km/h)
| Type | Length (m) | Weight (t) | Duration (hrs) | Speed (km/h) | Cost ($M) | Special Requirements |
|---|---|---|---|---|---|---|
| 1:24 | 180-200 | 85-95 | 72 | 200 | 3.8-4.2 | Dynamic Testing |
| 1:20 | 160-180 | 75-85 | 66 | 180 | 3.4-3.8 | Geometry Control |
| 1:18.5 | 150-170 | 70-80 | 60 | 160 | 3.2-3.6 | Stress Management |
CONVENTIONAL TURNOUTS (<160km/h)
| Type | Length (m) | Weight (t) | Duration (hrs) | Speed (km/h) | Cost ($M) | Special Requirements |
|---|---|---|---|---|---|---|
| 1:16 | 120-140 | 60-70 | 54 | 140 | 2.8-3.2 | Standard Testing |
| 1:12 | 100-120 | 50-60 | 48 | 120 | 2.4-2.8 | Standard Testing |
| 1:9 | 80-100 | 40-50 | 48 | 80 | 2.0-2.4 | Standard Testing |
EQUIPMENT REQUIREMENTS:
PRIMARY EQUIPMENT
| Equipment | Capacity/Type | Quantity | Purpose | Backup Required |
|---|---|---|---|---|
| Crawler Crane | 250t | 1 | Main lift | Yes |
| Mobile Crane | 80t | 1 | Support | Yes |
| Excavator | 35t | 2 | Removal/prep | Yes |
| Tamper | Computer | 1 | Geometry | Yes |
| Regulator | Standard | 1 | Ballast | Yes |
| Flash-butt Welder | Mobile | 1 | Rail joints | Yes |
| Rail Tensor | 70t | 2 | Stress control | Yes |
SUPPORT EQUIPMENT
| Equipment | Type | Quantity | Purpose | Backup Required |
|---|---|---|---|---|
| Generator | 100kVA | 2 | Power | Yes |
| Light Tower | LED | 6 | Illumination | Yes |
| Survey Station | Digital | 2 | Setting out | Yes |
| Track Jack | Hydraulic | 4 | Alignment | No |
| Compactor | 3t | 2 | Formation | No |
| Tool Container | 20ft | 2 | Workshop | No |
72-HOUR POSSESSION BREAKDOWN:
Pre-Possession (6 hours):
- Site establishment
- Crane setup
- Material staging
- Survey control
- Safety briefing
Phase 1 (Hours 0-18):
- Track isolation
- OHW adjustment
- Remove existing track
- Begin excavation
- Material removal
Phase 2 (Hours 18-36):
- Complete excavation
- Formation preparation
- Drainage works
- Initial ballast
- Survey checks
Phase 3 (Hours 36-54):
- Turnout placement
- Initial alignment
- Rail connections
- Begin tamping
- Systems integration
Phase 4 (Hours 54-72):
- Final alignment
- Welding works
- System testing
- Certification
- Handback preparation
QUALITY CONTROL:
Critical Measurements:
- Track Geometry:
- Gauge: +0/-2mm
- Alignment: ±2mm
- Top: ±2mm
- Twist: 1:500 max
- Switch Performance:
- Throw force: <2.5kN
- Detection: 100%
- Free wheel: Verified
- Point closure: <1mm
- Testing Requirements:
- Geometry recording
- Switch operation
- Load testing
- Speed ramping
- Monitoring period
Note 1: Installation rates are indicative only.
Note 2: Rates vary based on:
- Turnout size
- Access conditions
- Weather impacts
- Equipment availability
- Team experience
Note 3: Installation calculation formula:
T = (BT × SF × AF × WF) + TC, where:
- BT = Base time
- SF = Size factor (1.2-1.8)
- AF = Access factor (1.1-1.4)
- WF = Weather factor (1.0-1.3)
- TC = Testing constant
