The name of the 1885 ceremonial spike completing the Canadian Pacific Railway is the Last Spike.
The spike was driven at Craigellachie, British Columbia, on November 7, 1885, by CPR director Donald Smith, later known as Lord Strathcona. Its installation symbolized the joining of the railway’s eastern and western sections and fulfilled Canada’s political commitment to connect British Columbia with the rest of the country.
Despite the ceremony’s grand symbolism, the spike itself was not made of gold. It was an ordinary iron railway spike, and Smith bent it while hammering it into the tie. The damaged spike was removed and given to him as a souvenir; another regular spike was placed in the track. A silver spike had also been prepared for the governor general, but bad weather prevented his attendance.
This is why “Golden Spike” is the wrong answer here. That term is strongly associated with the 1869 completion of the first U.S. transcontinental railroad at Promontory Summit, Utah. “Last Spike” is the established name for Canada’s 1885 CPR ceremony, even though several physical spikes and souvenirs became connected with the event.