Predicting new double-stack operations in a naturally ventilated tunnel

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