What should you do to release (loosen) the parking brakes for towing a damaged tram?

Explanation

Correct answer: Mechanically or electrically unfasten the brake release.

The parking brakes in a tram are 'fail-safe' brakes, which means that when stationary or in the event of a failure, they are automatically applied to prevent the vehicle from rolling away. To enable an immobilised tramcar to be towed, they must be released manually. Special mechanisms called release devices are used for this purpose, which, depending on the design, are released mechanically or electrically.

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