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What about those one way catches often seen at car parks to prevent people driving against them? OK in the correct direction as they lay flat but stay up if you try to drive against them. I think the people who risk getting hit by a train will be more likely not to risk tyre damage. I do not mean the type where a great wide section rises up but the smaller 'finger' type that can be driven over at a reasonably fast speed.
John.
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