On Thursday, August 5th, 1847
Committee on projected railroad from Springfield to Alton reports in "Journal." Expense of grading, population to be served, products to be transported and estimated value, probable income, possibility of connections with East, and means of financing are dealt with. John Calhoun's name heads list of signers, with Lincoln's second. Report on Alton and Springfield Railroad, 5 August 1847, CW, 1:398-405.

Related sources from The Collected Works of Abraham Lincoln

Bond for John M. Cabaniss

Report on Alton and Springfield Railroad

Lincoln Timemap for 1847