What is the different between a f-type coupler and a double shelf coupler on rail road cars?

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Integra Vs Prelude, which one is over all better?

The standard " E " type rail car coupler is not equipped with safety shelves. The couplers equipped with double-shelves secure the collar over & under the coupler head recess that receives the knuckle of a mated coupler to prevent coupler disengagement or pull-out during a derailment.

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