Louis Duncan, 1911 Encyclopædia Britannica (1911)
“ To start a tramcar, four or five times as great a pull is required as will keep it in motion afterwards, and the constant starting after stoppages, especially on inclines, is destructive to horses. Horses employed on tramways are worked only a few hours a day, a day's work being a journey of ro or 12 m., and much less on steep gradients. ”
