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Slippery rail is a condition of railways (railroads) caused by fallen moist leaves that lie on and cling to the top surface of the rails of railway tracks. The condition results in significant reduction in friction between train wheels and rails, and in extreme cases can render the track temporarily unusable. In Britain, the situation is colloquially referred to as "leaves on the line".==Causes==In heavily deciduous forested areas like the American Mid-Atlantic states, New England, many parts of Europe including the UK, and Southern Ontario, Canada, where there is heavy leaf fall in the autumn, the problem can arise. Where the leaves fall across a railway route, some of the leaves fall on the railheads; and at the passage of the next train, they are heavily compressed into a slippery low-friction coating on the rail and on the wheel treads. If the climate is damp, the wet leaves adhere to the rail very effectively. The draft caused by the passage of the train causes nearby leaves to be caught up in air currents, and more leaves are deposited on the railhead.The build up of this material is incremental, and it is hard enough not to be quickly worn away by the ordinary passage of trains.
Slippery rail is a condition of railways (railroads) caused by fallen moist leaves that lie on and cling to the top surface of the rails of railway tracks. The condition results in significant reduction in friction between train wheels and rails, and in extreme cases can render the track temporarily unusable. In Britain, the situation is colloquially referred to as "leaves on the line".
==Causes==
In heavily deciduous forested areas like the American Mid-Atlantic states, New England, many parts of Europe including the UK, and Southern Ontario, Canada, where there is heavy leaf fall in the autumn, the problem can arise. Where the leaves fall across a railway route, some of the leaves fall on the railheads; and at the passage of the next train, they are heavily compressed into a slippery low-friction coating on the rail and on the wheel treads. If the climate is damp, the wet leaves adhere to the rail very effectively. The draft caused by the passage of the train causes nearby leaves to be caught up in air currents, and more leaves are deposited on the railhead.
The build up of this material is incremental, and it is hard enough not to be quickly worn away by the ordinary passage of trains.
抄文引用元・出典: フリー百科事典『 leaves on the line".==Causes==In heavily deciduous forested areas like the American Mid-Atlantic states, New England, many parts of Europe including the UK, and Southern Ontario, Canada, where there is heavy leaf fall in the autumn, the problem can arise. Where the leaves fall across a railway route, some of the leaves fall on the railheads; and at the passage of the next train, they are heavily compressed into a slippery low-friction coating on the rail and on the wheel treads. If the climate is damp, the wet leaves adhere to the rail very effectively. The draft caused by the passage of the train causes nearby leaves to be caught up in air currents, and more leaves are deposited on the railhead.The build up of this material is incremental, and it is hard enough not to be quickly worn away by the ordinary passage of trains.">ウィキペディア（Wikipedia）』
■leaves on the line".==Causes==In heavily deciduous forested areas like the American Mid-Atlantic states, New England, many parts of Europe including the UK, and Southern Ontario, Canada, where there is heavy leaf fall in the autumn, the problem can arise. Where the leaves fall across a railway route, some of the leaves fall on the railheads; and at the passage of the next train, they are heavily compressed into a slippery low-friction coating on the rail and on the wheel treads. If the climate is damp, the wet leaves adhere to the rail very effectively. The draft caused by the passage of the train causes nearby leaves to be caught up in air currents, and more leaves are deposited on the railhead.The build up of this material is incremental, and it is hard enough not to be quickly worn away by the ordinary passage of trains.">ウィキペディアで「Slippery rail is a condition of railways (railroads) caused by fallen moist leaves that lie on and cling to the top surface of the rails of railway tracks. The condition results in significant reduction in friction between train wheels and rails, and in extreme cases can render the track temporarily unusable. In Britain, the situation is colloquially referred to as "leaves on the line".==Causes==In heavily deciduous forested areas like the American Mid-Atlantic states, New England, many parts of Europe including the UK, and Southern Ontario, Canada, where there is heavy leaf fall in the autumn, the problem can arise. Where the leaves fall across a railway route, some of the leaves fall on the railheads; and at the passage of the next train, they are heavily compressed into a slippery low-friction coating on the rail and on the wheel treads. If the climate is damp, the wet leaves adhere to the rail very effectively. The draft caused by the passage of the train causes nearby leaves to be caught up in air currents, and more leaves are deposited on the railhead.The build up of this material is incremental, and it is hard enough not to be quickly worn away by the ordinary passage of trains.」の詳細全文を読む
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