| 摘要 |
An insulated runner for use in an overhead electric traction system comprises at least one elongate reinforcing body of high tensile strength made wholly or substantially of insulating material, for example a rod of resin bonded glass fiber, and provided with metal terminal fittings, and at least one body of abrasion-resistant ceramic or vitreous material which is associated with, and extends lengthwise between the terminal fittings of, the reinforcing body and which provides an effective running surface. The outermost surface of the insulated runner between its terminal fittings is of an insulating material that is resistant to tracking. The abrasion-resistant body may enclose fully the part of the reinforcing body extending between the terminal fittings. Preferably, however, the reinforcing body and parts of the abrasion-resistant body are enclosed throughout their lengths by a body of a resin composition or other tracking-resistant material.
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