An improved guide rail in particular for a transport device or stretching unit is distinguished inter alia by the following features—the cooling device comprises at least one cooling duct which extends in a zigzag shape inside the guide rail and which is formed by connected transverse bores, and/or—the guide rail comprises at least two half-shells or halves between which a flexible tube is arranged in a sandwich-like manner to form at least one cooling duct, and/or—at least one cooling duct is arranged outside the guide rail so as to extend parallel thereto, and, in the longitudinal direction of the guide rail, in each case bores extending transversely thereto are made, into which bores outwardly projecting heat lines and/or heat pipes are inserted.
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