The maximum value of the 'throw of switch' for a Broad Gauge railway line is__________________?
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Answer: D. 115 mm
Explanation
The maximum throw of switch for a Broad Gauge railway turnout is standardized at 115 mm to allow proper wheel flangeway clearance. This specific opening distance ensures that train wheel flanges pass freely without striking the open switch rail. Mechanical signaling linkages are precisely calibrated to achieve this exact maximum lateral displacement at the switch toe. Turnouts utilize movable tongue rails to guide trains smoothly from one track to another in desired directions. The throw of switch refers to the horizontal distance the tongue rail moves away from the stock rail. Broad gauge systems maintain wider track dimensions, requiring larger throw values compared to narrow or meter gauge tracks.
Values such as 89 mm or 95 mm are typical for narrower track gauges and lack sufficient clearance for broad gauge wheels. An excessive throw distance of 115 mm represents the maximum approved engineering standard rather than arbitrary higher numbers. Smaller dimensions would trap wheel flanges and cause severe mechanical jamming during high-speed diverging train movements.
- Subject
- Engineering
- Category
- Civil Engineering
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- —
- Difficulty
- medium
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