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The City and South London Railway in an attempt to work around their poor reputation and make it easier to raise funds, the next bill for an extension of the line was submitted in November 1900 by a notionally separate company, the Islington and Euston Railway (I&ER), albeit one that shared its chairman with the C&SLR.
The proposed railway was to run from the, as yet unfinished, C&SLR station at Angel to the mainline stations at King's Cross, St. Pancras and Euston. The I&ER bill coincided with a rash of other railway bills encouraged by the successful opening of the Central London Railway (CLR) in 1900 and was considered alongside these by another Parliamentary Joint Committee in 1901. The bill was approved, but the time taken for the committee's review meant that it had to be resubmitted for the 1902 Parliamentary session.
In the 1902 session, the bill was considered again but was subject to opposition from one of London's other underground railways, the Metropolitan Railway (MR), which considered the proposed extension to be a threat to its service between King's Cross and Moorgate.
The I&ER also submitted a petition to allow the C&SLR to take over the powers of the railway if approved. The committee reversed its earlier decision and rejected the bill.
In November 1902, the C&SLR submitted a bill in its own name for the Euston extension as well as the authority to take over the dormant powers of the C&BR. At Euston, the railway would have an interchange with the planned but not yet built Charing Cross, Euston and Hampstead Railway (CCE&HR). The intention for C&BR powers was to adapt them to provide a new station at King William Street, which would have pedestrian subway connections to the C&SLR's Bank station and the Metropolitan District Railway's (MDR's) Monument station.
A third pair of tunnels would be constructed under the Thames to connect with the original abandoned tunnels north of Borough station and then the C&BR route would be constructed as previously approved with connections to the existing C&SLR route at London Bridge and Oval. This time, the bill was approved and received Royal assent as the City and South London Railway Act, 1903 on 11 August 1903.
Although the C&BR proposals were never used, the Euston extension was quickly built and opened on 12 May 1907, with stations at King's Cross for St. Pancras and at Euston