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Covert Ops: Nuclear Dawn, otherwise known as Chase the Express, is a video game created by Sugar and Rockets for the PlayStation, and released in 2000.

The game's story is quite similar to the movie Under Siege 2. You play as NATO Lieutenant Jack Morton, the sole survivor of a terrorist strike on the Blue Harvest (an armored train). Travelling around the various carriages of the train, you must defeat the boarded terrorists and find the French ambassador, as well as preventing the terrorists from using a nuclear weapon.

In eastern Europe, a terrorist group known as the "Knights of the Apocalypse" successfully breach security and hijack the NATO armored train, Blue Harvest. Amongst those on board is the French Ambassador to Russia, Pierre Simon, and his family. Boris Zugoski, former KGB agent and leader of the terrorists, demands 20 billion US dollars and safe passage into France in exchange for the lives of the Simon family. The presence of a nuclear bomb on board the train also presents a great risk. A rescue team is dispatched to the location of the captured train with the hope that the hostages can be extracted.

Lieutenant Jack Morton, a U.S. Air Force pilot, is a member of a multi-national NATO escort assigned to the Blue Harvest. He is the only survivor of the terrorist's initial assault, which consisted of a missile attack on the fleet of helicopters escorting the Blue Harvest out of Russia as well as the explosion of bombs planted within the train. Jack, however, was able to leap from his chopper onto the train during the attack. Upon radioing headquarters, he is briefed on the situation and is given his orders: locate and protect the Ambassador until help arrives.

You play the role of Lieutenant Jack Morton in this Activision version of the Japanese Chase the Express title.

At it's core the game is a third-person shooter, but with elements that diverge from this. Such as puzzle solving, key searching, stealth and, at several points, driving the train itself. The game is divided in "levels" which take place on each carriage of the train, one such carriage may require you to find key A that opens door B, while another could lead into a "boss" battle before you have to disarm a bomb.

Game saves are completed in the trains toilets, where you'll also find an item box ala Resident Evil to store weapons and key items as the playable character has limited inventory space.