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Aparato gimnástico, caracterizado porque comprende un tramo de carril constituido por dos railes con pistas de rodadura cóncavas y unidos entre si por travesaños, presentando cada rail en sus extremos respectivos topes de gomas que limitan el desplazamiento de dos carros dispuestos entre dicho railes y provistos inferiormente de juegos de ruedas que se corresponden con cada uno de los railes.
Perfeccionamientos aportados a los ferrocarriles aereos con gondolas suspendidas de carros rodantes en forma oscilante en sentido transversal con respecto a la direccion de la marcha.