David Bartlett Sloan

• George Gibbs, M.E., D. ENG. (1861-1940), E. Rowland Hill, M.E., E.E. (1872-1948)
• George Gibbs, M.E., D. Eng. (1861-1940), E. Rowland Hill, M.E., E.E. (1872-1948), pioneers in railroad electrification