In fact it was looked into by Caltrain's predecessor, the Southern Pacific railroad https://cdnc.ucr.edu/?a=d&d=SDI19210907.2.17 https://cdnc.ucr.edu/?a=d&d=SD

In fact it was looked into by Caltrain's predecessor, the Southern Pacific railroad https://cdnc.ucr.edu/?a=d&d=SDI19210907.2.17 https://cdnc.ucr.edu/?a=d&d=SDI19210907.2.17 Stockton Independent, September 1921 > Electrification of Lines to Be Looked Into by S.P. > SAN FRANCISCO, Sept. 6. — William Sproule, president of the Southern Pacific company, has received authorization from the board of directors of the railway to investigate the feasibility of electrifying the Southern Pacific lines between San Francisco and Peninsula points, It was announced here today. Better and more frequent service would result from electrification of the peninsula lines, according to parties who petitioned the Southern Pacific to take this action. (Unfortunately, it was dismissed a couple weeks later: https://cdnc.ucr.edu/?a=d&d=SDI19210917.2.13 https://cdnc.ucr.edu/?a=d&d=SDI19210917.2.13)