McConnel set about improving Bryn Eglwys to increase its output . In 1865 his company earmarked money for the construction of a narrow gauge railway connecting the quarry with the port of Aberdyfi . McConnel set about improving Bryn Eglwys to increase its output and in 1865 his company earmarked money for the construction of a narrow gauge railway connecting the quarry with the port of Aberdyfi .