These documents detail Raisbeck's actions in relation to the proposed Middlesborough extension. He was opposed to the move as it would have hurt the interests of Stockton-on-Tees and conflicted with his personal interest as a member of the committee of the Tees Navigation Company, who stood to lose traffic with the opening of the extension. It documents Raisbeck's summons to the House of Commons to testify before a committee regarding the branch. Correspondence with Thomas Meynall shows an increasing resentment towards the Quakers on the Stockton & Darlington Railway committee. The series also covers the events and actions of Francis Mewburn that caused Raisbeck to submit his resignation.