testing Several functions during running of the train
As a rail joint, the bolted joints are usually used to join rail tracks together before the are welded. As to joining two rails with differing sections, the compromise joints are mostly used. And the insulated joints are always used as the bonded or non-bonded joints.
Although the perform of these three types of rail joints is different, they still have many similar features:
Bolts and bars are all used and a discontinuity is created on the running surface of the rail track
The discontinuity can accelerate track degradation around the rail joints while trains are running
Today the worldwide famous insulated rail joints are bonded insulated rail joints and polyurethane insulated rail joints.
Bonded insulated rail joints are mostly used to separate electric circuits in rails and turnouts. Because of widely used in continuously welded rails (CWR), the bonded insulated joints in rails must be ensured to transfer longitudinal forces arising in the railtracks. And insulated joints can also cut in square or angular.
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