From the earliest days, the EUR had intended to extend beyond Ipswich, to
Bury and to Norwich. This was opposed by the ECR, which planned to be the sole connection to Norwich when their line from Ely was completed. A number of other competing schemes went to the 1845 session of Parliament, and key among these was the EUR's Bury extension railway. This was promoted as a nominally independent company, the Ipswich and Bury Railway Company (I&BR). This was incorporated on 21 July 1845 with share capital of £400,000 to build from Ipswich to Bury St Edmunds. The proposed line was 26 miles long, following the
Gipping Valley. Once again Thomas Brassey was given the contract for construction; an elaborate ground breaking ceremony took place on 1 August 1845. The tunnel was to be 361 yards in length; it was Bruff's first tunnel, and it proved very difficult to build, particularly due to ground water, and at one stage Bruff considered abandoning the tunnel, but it was completed in September 1846 and on 19 September 1846 a celebratory dinner was held in the tunnel. A further challenge for construction was in the
Stowmarket area, where there was marshy ground; indeed the bog was ascertained to be 80 feet deep. The EUR employed
George Stephenson's method for building across the
Chat Moss bog, and a raft of brushwood and faggots was used to give the embankment a firm footing. The
River Gipping was also diverted to aid the project. On 26 November 1846 the first test train ran to Bury St Edmunds with stops at most stations on the route. The Bury station had not been completed, so a temporary station on the Ipswich side of an uncompleted road bridge was used. An elaborate celebratory meal was given. Goods operation on the line started on 30 November 1846, and a formal opening followed on 7 December 1846, when a special train ran from
Shoreditch (ECR station) to Bury. The Board of Trade inspection took place on 15 December 1846 and the line opened for traffic on 24 December. The permanent station at Bury opened in mid-November 1847, after a bridge over the main road had been finished, enabling the short extension. ==Extending to Norwich, and amalgamation==