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Predicting new double-stack operations in a naturally ventilated tunnel. Sample Presented by: Justin Edenbaum Co-author: Not listed. What is a long tunnel for a train length of 1.6 km (1 mile) ?. Longer than 8 km (5 miles)? Longer than 3.2 km (2 miles)? - PowerPoint PPT Presentation
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Presentation Engineer
Predicting new double-stack operations in a naturally
ventilated tunnel
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Sample Presented by:Justin Edenbaum
Co-author:Not listed
Presentation Engineer
What is a long tunnel for a train length of 1.6 km (1 mile) ?A. Longer than 8 km (5 miles)?B. Longer than 3.2 km (2 miles)?C. Longer than 1.6 km (1 miles)?D. Longer than 0.8 km (0.5
miles)?
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Presentation Engineer
Train length
Technology enables longer, heavier trains– Locomotives more powerful,
sophisticated– Simulations and institutional knowledge– Simulations optimized for surface
operations
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Presentation Engineer
What about Tunnels?
Simulations do not account for tunnels
Naturally ventilated tunnels Transient problem Will my new operations get
through the tunnel?
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Presentation Engineer
Agenda What is a long tunnel? Naturally ventilated tunnels
– Locomotive performance– Relative airflow– Piston effect– Train performance
Notched tunnel Relative analysis Results Conclusions
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Naturally ventilated tunnels
Diesel locomotives operations outside
Diesel Engine
Emissions
Radiator
Diesel Engine
Emissions
Radiator
Presentation Engineer
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Naturally ventilated tunnels
Relative airflow affects locomotive operation
Diesel Engine
Emissions
Radiator
Diesel Engine
Emissions
Radiator
Presentation Engineer
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Naturally ventilated tunnels
No trainStill Air
Train enters TunnelAirflow accerlates
Train inside tunnelAirflow steady
Train leaves tunnelAirflow decelerates
Legend
AirflowTrain movement
Piston effect
Presentation Engineer
Naturally ventilated tunnels Train performance in tunnel
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Train Speed Relative Airflow
Train configuration
Track grade and curvature
Factors always affecting train
speed
Legend:Factors inside a
tunnel
Locomotive Performance
(inside and outide)
Presentation Engineer
Agenda What is a long tunnel? Naturally ventilated tunnels Notched tunnel
– Sample tunnel– Double-stack operations
Relative analysis Results Conclusions
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Presentation Engineer
Notched tunnel
Sample Tunnel– Location– 3,460 meters long
(~2 miles)– 1.65% uphill grade
East to West
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California
Nevada
Notched tunnel
Double stack operations– Notch roof
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Notched tunnel
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Presentation Engineer
Agenda What is a long tunnel? Naturally ventilated tunnels Notched tunnel Relative analysis
– Current vs. future operations– Ventilation model– Model inputs
Results Conclusions
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Presentation Engineer
Relative analysis
Worse-case, grain train– Length ~2km (1.2 miles)– Lead, mid, end consist (3x3x1)– Minimum entering speed
19.3 kph (12mph)
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TunnelSnowshed
Worse-case, grain train1,991 m (6,530 ft)
960 m 875 m
3,260 m
200 m
133
Number of locomotive
Legend
Uphill
Presentation Engineer
Relative analysis
Double stack, design case– Length ~4km (2.5 mile)– Lead, mid consist– Simulated speed 24 km (15 mph)
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TunnelSnowshed
Worse-case, grain train1,991 m (6,530 ft)
960 m 875 m
3,260 m
200 m
133
Number of locomotive
Legend
2,590 m
Double stack, design case – 3,940 m (12,940 ft)3
31,219 m
Uphill
