| 摘要 |
A permanent electrical contact applicable to the web of rails. The contact comprises a bush in electrically conductive material having a tubular stem suitable for inserting in a hole in the web of a rail, a flanged head radially widened compared to the stem and suitable for engaging in abutment with a portion surrounding the hole, and an axial through hole in which a punch can be inserted to expand the tubular stem radially and join a radially outer surface of the stem closely with the hole. At least a portion of the outer surface of the stem is substantially made of a first conductive metal and at least a portion of the flanged head is substantially made of a second conductive metal different from the first conductive metal.
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