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When the accessible motor electric power greater in the course of the 1920s and 30s and bracing was no more essential, the unbraced or cantilever monoplane turned the most typical method of powered type.چرخهای محرک یک لوکوموتیو. چرخ قطار یا چرخ ریلی نوعی چرخ است که مخصوص استفاده در �