Underground Electric Railways Company of London Its early success resulted in a rush of proposals to Parliament for other deep-level routes under the capital, but by 1901 only two more lines had opened: the Waterloo & City Railway (W&CR) in 1898 and the Central London Railway (CLR) in 1900. Construction had started on one other line and then stopped following a financial crisis. The rest of the companies were struggling to raise funding. The District Railway (DR) was a sub-surface underground railway which had opened in 1868. Its steam-hauled services operated around the "Inner Circle" and on branches to Hounslow, Wimbledon, Richmond, Ealing, Whitechapel and New
London Underground rolling stock numbering and classification London Underground rolling stock numbering and classification Rolling stock used on the London Underground and its constituent companies has been classified using a number of different schemes. This page explains the principal systems. The numbering and classification of electric multiple unit stock on the London Underground is usually related to the type of line that the trains are used on. There are two distinct types of line: 'Sub-surface' lines (earlier lines built on the cut-and-cover method, which use trains of similar size to those on the national railway network), and 'Tube' lines (deep-level lines, built to a more restricted size).