In the field of industrial material handling, rail-mounted transfer rail cars (Rail Transfer Carts) have become key equipment for fixed-route material flow, leveraging their core advantages of “heavy-load stability and precise control”. Different from the flexible mobility of trackless transfer carts, rail-mounted transfer carts achieve directional operation based on preset rails, forming unique competitiveness in load-bearing capacity, operation stability, and environmental adaptability. Rail car are widely used in key fields such as heavy industry production and heavy equipment manufacturing. This article will comprehensively analyze this industrial “handling heavyweight” from four dimensions: core characteristics, typical application sites, selection logic, and development trends.