| Swingnose Crossing |
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Information AboutSwingnose Crossing |
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| rail infrastructure | |
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A swingnose crossing is a device used at a railway Turnout to eliminate the gap at a V-crossing aka Frog . FIXED CROSSING The gap at a fixed V-crossings are a weak point on the railway line where the heavy wheel must jump the gap of about 10cm, pounding the rail so much that the steel can deform and/or wear away. The damage spreads to other components including the wheels, and the noise can also be a nuisance. Repairing the damage can also be a problem if the railways are busy with trains, and few opportunities exist between trains to do the repairs. In addition, the fixed crossing can only be so fine an angle, say 1 in 20, before the wheels start to go the wrong way at the V of the V-crossing. This limits the maximum speed of the crossing. SWINGNOSE CROSSING The swingnose crossing also overcomes the weakness of the gap by moving the point of the V-crossing from side to side depending on which way the turnout or diamond crossing is set. The wheels are supported the whole way and do have to make the noise and vibration that would otherwise occur. Swingnoses crossing allow the V-crossing to have a fine an angle as required, allowing for higher speeds. PARAMETERS Swingnose crossings would be used for V-crossings finer than about 1 in 20, and for Axle Load s in excess of 25T. INTERLOCKING Swingnose crossings need to operate at the same time as the turnout switches to which they belong. This may be too stiff for manual operation, and may require power operation. SEE ALSO |