What railroad for which Oakes Ames is credit as being the single most important influence in building was caught up in the  Crédit Mobilier scandal?
Oakes Ames Oakes Ames (January 10, 1804 – May 8, 1873) was an American manufacturer, capitalist, and member of the United States House of Representatives from Massachusetts. As a congressman, he is credited by many historians as being the single most important influence in the building of the Union Pacific portion of the transcontinental railroad. He is also noted for the subsequent scandal that alleged the improper sale of stock of the railroad's construction company.
Northern Pacific Railway The Northern Pacific Railway (reporting mark NP) was a transcontinental railroad that operated across the northern tier of the western United States, from Minnesota to the Pacific Northwest. It was approved by Congress in 1864 and given nearly 40000000 acre of land grants, which it used to raise money in Europe for construction.