As the 6 train speeds through the underground tunnels of Manhattan, a group of cunning hijackers – Ryder, Bashkin, Emri, and Phil Ramos, the former train operator – seize control, taking passengers hostage. The Metropolitan Transportation Authority's own Walter Garber (John Travolta), summoned from the Rail Control Center, receives a foreboding call from Ryder, demanding a staggering $10 million ransom within the hour and issuing a grim threat of executing one hostage every minute if his demands are not met.
In a ruthless act, Bashkin brutally eliminates a curious officer from the New York City Transit Police. As chaos unfolds, most passengers are released, leaving only the motorman in peril. Garber, drawn into a desperate game of negotiation, must tread carefully as Ramos and Emri establish an internet connection deep within the tunnel. The hijackers' laptop presents a dire picture: the Dow Jones Industrial Average plummeting nearly 1,000 points due to the crisis.
As Garber fights to maintain order from the Rail Control Center, a hostage's laptop unexpectedly connects to the internet, granting the authorities a crucial insight into Ryder's hideout. Lieutenant Camonetti from the New York City Police Department Emergency Service Unit takes over negotiations, but his show of force backfires when he kills the train's motorman to assert dominance.
The stakes escalate when Camonetti uncovers Garber’s alleged wrongdoing—accepting a $35,000 bribe regarding new Japanese subway cars. This revelation fuels Ryder's demands, compelling Garber to confess under threat. With lives hanging in the balance, Garber fabricates a narrative of moral choice, claiming the bribe was for his child's education.
As the clock ticks down, the mayor reluctantly agrees to Ryder's ransom request, instructing the police to deliver the funds. Yet, fate intervenes; the police car crashes on the way, leaving Garber to concoct a ruse that the money has arrived. Unbeknownst to him, Ryder is monitoring the situation and remains unfazed.
In a shocking turn, Ryder coldly executes an innocent child's mother, heightening the tension. Just when despair seems imminent, a former soldier among the hostages heroically sacrifices himself to save her. In the ensuing chaos, an Emergency Services Unit sniper is bitten by a rat, leading to an accidental discharge that kills Ramos.
The intense standoff further deteriorates into a brief but fierce gunfight as the police scramble to respond to the crisis. As Garber's interactions are scrutinized, a darker truth begins to unfold: Ryder is exposed as Dennis Ford, a disgraced executive from a private equity firm who had previously orchestrated an intricate investment fraud scheme and been handed a lengthy prison sentence. The mayor's inner circle quickly deduces that Ryder is manipulating the market through strategic put options, further aggravating the financial turmoil.
As tensions mount, Ryder insists that Garber personally deliver the ransom, avoiding any law enforcement interaction. Garber is covertly relocated, armed for protection. Upon arrival at the designated drop-off point, Ryder outlines his demands: operate the train beneath 33rd Street and navigate to safety, ensuring he can part ways with his accomplices. In a clever maneuver, Garber breaks away at a railway crossing, pursuing Ryder to Track 61, located beneath the iconic Waldorf Astoria hotel.
After bidding farewell to Bashkin and Emri, who meet their demise in a police gunfight, the train falters just before reaching Coney Island. In a startling twist, Ryder mysteriously vanishes. Unwavering, Garber chases him through the vibrant streets of Manhattan, confronting him on the pedestrian walkway of the famed Manhattan Bridge.
In an electrifying standoff, Garber confronts Ryder with his weapon drawn. Ryder issues a chilling ultimatum: Garber has only ten seconds to pull the trigger or face dire consequences. As the countdown begins, Ryder brandishes a firearm, forcing Garber's hand and leading to a heartbreaking confrontation that results in Ryder's demise, witnessed with approval by Camonetti.
In the wake of this harrowing episode, the mayor expresses deep gratitude towards Garber, vowing to assist in exonerating him in light of his admission of corruption. As the story concludes, Garber returns home to his wife, carrying a bouquet of groceries he promised to purchase—a touching reminder of the normal life he yearns to reclaim.
