Electrification, of course, lends itself to many pleasing station improvements. At the present time Great Britain carries more passengers electrically than any other country in Europe, and the London suburban electrifications of the Southern voltages could be shown to be advantageous. In 1928 a second advisory committee confirmed the standard of direct current at 1,500 volts, but instead of making the lower voltage dependent on the consent of the Ministry, it also standardised 750 volts, leaving 3,000 volts to be applied for. In future, extensions or new railway electrifications at Home are to be either on the higher or lower voltage of 1,500 or 750, but the fact that by far the greater part of the existing multiple unit represents the largest individual suburban electrification in the world. Although the abundance of excellent coal supplies has tended to act as a brake to Home mainline electrification, important works of this character are to be put in hand in the near future, notably in the London and Manchester areas, while between London and Brighton the double track main line of the Southern system is at present being electrified throughout.