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Protofour
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== S4 Standard == The S4 Standard is maintained as part of the P4 standards.<ref name=p4standard />{{rp|4}} The S4 Standard removes an allowance in the P4 standards for the tight (compared to the prototype) curves used on model railways. The wheel back to back in S4 is therefore slightly wider than P4, and the related track work dimensions are dead-scale.
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