According to China's regulations, the material thickness of the side guardrail of freight cars shall not be less than 2mm, and the bottom edge shall not be more than 55cm from the ground. The thickness of rear guardrail material shall not be less than 3mm, the bottom edge of height-adjustable guardrail shall not be greater than 45cm from the ground, and the bottom edge of height-adjustable guardrail shall not be greater than 55cm from the ground.
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