In 1906 the longest of the tunnels plus all other tunnels except tunnel number four were completed. Bridge building was delayed in 1906 because  lumber was in short supply. Due to a major earthquake in San Francisco in April 1906 and the rebuilding of that city. In the year 1907 track had been laid to mile fifty. June 1907 saw bridge building timbers again arriving in Seward. 

Problems had began to surface around this time with the unending cost of building the rail line. All major decisions had to be refereed to the backers of the Alaska Central Railroad  in Chicago, they had to approve all decisions. A financial panic in 1907 brought the bank that controlled the loans of the Alaska Central Railroad to the point of failure. John Ballaine with the backing
of the banks that controlled the loans asked for receivership of the Alaska Central Railroad and the Tanana Construction Company. The owners of the notes granted Ballaine request and foreclosure was brought against the railroad. It was sold and a new company was formed to finish building the railroad. 

Work continued and and the railroad reached mile fifth three in 1908. May 1909 saw a new engineering team arrive and try to restart construction of the railroad. Work continued at Turnagain Arm and in October the rail ran from Seward to Cook Inlet. The Alaska Central Railroad was again sold to a syndicate of bond holders for six hundred thousand dollars american.
November 1909 saw the track at mile seventy two. The new company was called the Alaskan Northern Railway Company. Construction had come to a stop while thing were reorganized. 

The Alaskan Northern Railroad ran trains to the end of the track. They hauled people and freight but construction did not continued. In April 1911 the railroad line still ended at mile 72. The coals fields had not developed as hoped. These were the days of Trust Busting and the coal fields lay undeveloped. Of one thousand one hundred coal claims, seven hundred forty
two were declared invalid by May 1911. The general manager of the railroads said that the road would not go forward until the first coal patentn was granted to a Matanuska coal claim. 

In August 1911, the Federal government looked at the possibility of owning the railroads. In December 1911, a bill was introduced in the Congress to construct a railroad from Seward to the coal fields on the Yukon River.President Taft in February 1912, also pushed for an Alaskan Railroad. In 1912 a group of Federal Commissions came to Seward to study the feasibility of taking over the railroad. 

Woodrow Wilson became president in 1913. He asked Congress to approve the construction of a Federal railroad system. The Senate committee on Territories issued a favorable report on the Alaska Railroad Bill. Which provided for construction of a railroad and an appropriation of forty million dollars to be raised by selling bonds. Late January 1913 the Jones-Chamberlain Alaska Railroad Bill passed the Senate. President Wilson signed the Alaska Railroad Bill on March 1913. 

In 1923 President Warren G. Harding drove a golden spike, at Nenana, which marked the completion of the Alaska Railroad. The cost to complete the railroad was sixty five million dollars.

Sources
"Alaska a History of the 49th State" Claus M Naske and Herman E Slotnick 
"History of the Gateway City" Mary J Barry