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File:NYCSub ExpJoint.jpg

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Description Subway track diagonal expansion joint (breather switch) on the Williamsburg Bridge. Due to thermal contraction and expansion each bridge changes its length over the seasons. This joint allows the tracks to give way avoiding stress buildup and deformation. Misalignment of the abrasion marks indicates that the image shows the bridge in a contracted state, which is consistent with the cold winter temperatures at the time the photo was taken. Image taken by Daniel Schwen on Dec 6th, 2005.
Date
Source Own work
Author Daniel Schwen


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6 December 2005

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current21:44, 12 December 2005Thumbnail for version as of 21:44, 12 December 20052,272 × 1,704 (1.8 MB)DschwenSubway track expansion joint on Williamsburg bridge. Due to thermal contraction and expansion each bridge changes its length. This joint allows the tracks to give way avoiding stress buildup and deformation. Image taken by Daniel Schwen o

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