ok thanks, but what was the reason it stop running in the first place?
It was built in '51 I believe, and it wasn't long before air travel across the oceans became possible. Once you could fly across the oceans, the trans-Atlantic ocean liners were no longer necessary
for international travel. In short, the airplane led to the demise of the trans-Atlantic liner.
A couple of interesting notes - The US Navy had a hand in the powerplant & paid a significant amount of the construction & installation of the powerplant. They wanted to use it as a troop ship (possibly carry around 10-15,000 troops) should another world war break out. Because of this, the SS United States was the fasted ocean liner ever built. Officially recorded max speed was around 38 knots. However, there are unofficial reports of her being capable of around 44 knots (51ish MPH) which is impressive.
She was also "fireproof" with a significant use of aluminum & asbestos in the interior construction.