| Notes |
Historical, Davidson's electric locomotive, about 1842, the advantages of electrification, the direct current system, method of feeding a short line, trolley wire reinforced, feeding sectional conatct conductors, the high tension direct current system, direct current railway system with high-tension three-phase transmission, rotary converter sub-stations for direct current railway, three-phase system, a simple rotary converter, mesh connections for transformers, 3-phase with high-tension transmission |