Predicting new double-stack operations in a naturally ventilated tunnel
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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
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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
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Presentation Engineer
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Naturally ventilated tunnels
Relative airflow affects locomotive operation
Diesel Engine
Emissions
Radiator
Diesel Engine
Emissions
Radiator
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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
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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)
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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
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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
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Number of locomotive
Legend
Uphill
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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