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Once the obtainable motor power improved during the twenties and 30s and bracing was no longer necessary, the unbraced or cantilever monoplane grew to become the commonest form of powered variety.چرخهای محرک یک لوکوموتیو. چرخ قطار یا چرخ ریلی نوعی چرخ است که مخصوص استفاده در مسیر