There are two railways in connection with the Metropolitan Railway, which are also to be carried underneath portions of London. The Metropolitan District Railway, when finished, will form the southern side of the inner railway circle that is to encompass London. It connects at Kensington, with the “Metropolitan Extension Railway” (a continuation from Paddington of the Metropolitan Railway). This extension is to run through Brompton to Pimlico, where it will be in closest proximity to the Victoria Stations of the London, Chatham and Dover, and of the London, Brighton and South Coast Companies; from there to Westminster Bridge, whence it is carried along, and, in fact, forms part of, the Thames Embankment, to Blackfriars Bridge. Here it is again in close contact, although at a different level, with the line of the London, Chatham and Dover Company, near its Ludgate Hill station. Proceeding eastward, it is carried as far as Trinity Square, Tower Hill, where it is to meet the eastern “Metropolitan Extension” of the Metropolitan Railway. These two sections finished, the whole inner Metropolitan circle will be completed. The distance from Kensington to Trinity Square is 33,150 lineal feet, or 6 miles and 1,470 feet, of which a little more than a third—that is, 10,974 feet—or 2 miles and 414 feet, are open cuttings or glass-covered stations, and a little less than two-thirds, or 4 miles and 1,056 feet, are in tunnel. The open cuttings and the tunnels are constantly alternating; the three longest of the latter are 665 feet; one is close to Gloucester Road Station, Brompton; one is at Tothill Street, Westminster; and the third is in the Thames Embankment. The gradients are favourable, there being only 2,352 feet (or less than half a mile) of 1 in 100, or 52 feet in the mile. These are all situated between Blackfriars Bridge and Trinity Square, Tower Hill. In addition to the foregoing main line of the Metropolitan District Line, there is to be a railway from Kensington High Street to join the West London Railway—the line that connects the London and North-Western and the Great Western railway systems north of the Thames with the Clapham Junction Station on the south. From Clapham Junction there is unbroken connection with all parts of the London and South-Western, and the London, Brighton and South Coast Railways. The length of the Kensington and West London Extension of the Metropolitan District Extension is to be 7,470 feet, or 450 feet less than a mile and a half, of which 5,565 are to be entirely open, 525 station roof and 1,380 covered way.