What amount of hand brakes must be applied on cars to make them secure when left standing on any track?

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Multiple Choice

What amount of hand brakes must be applied on cars to make them secure when left standing on any track?

Explanation:
Two hand brakes are used to secure standing cars. One brake alone can be overcome by forces like wind, minor slope, or wear and movement of the car, so applying a second independent hand brake provides the necessary redundancy to keep the car from moving. This applies on any track, including level ground, because the goal is to ensure movement cannot start even if one brake slips or releases. Using more than two is not required for standard securing.

Two hand brakes are used to secure standing cars. One brake alone can be overcome by forces like wind, minor slope, or wear and movement of the car, so applying a second independent hand brake provides the necessary redundancy to keep the car from moving. This applies on any track, including level ground, because the goal is to ensure movement cannot start even if one brake slips or releases. Using more than two is not required for standard securing.

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