For six decades, Subway has reigned as the king of sub shops – but lately, there have been signs that the fast food chain's reign is coming to an end.

A Subway location in Georgia made light of the Titanic sub disaster on its sign (Amanda Butler via Twitter) ...

A Subway restaurant in Rincon, Georgia posted a sign that read, "Our subs don't implode," jokingly referencing the Titan submersible disaster, sparking backlash.

A Subway sandwich eatery had a sign that read 'our subs don't implode' after the Titan submersible implosion that killed five passengers.

Georgia resident Timothy Mauck posted a photo of a sign on a Subway sandwich shop in Rincon reading, “Our subs don’t implode.” ...

An in-depth look at the process that overhauls every single wheel, motor, brake, axel, wire and door on every car in the New York City system.

The agency will sell dozens of decommissioned subway station signs, red-and-white station exit globes, train car seats, and even defunct MetroCard reload machines.

The MTA was moving merch instead of people Monday. The agency’s annual pop-up sale drew shoppers looking to buy quirky items like used subway station signs — or just the right MetroCard… ...

A Subway sandwich shop on the east side of Cincinnati is closing after nearly 40 years of business. A patron posted the sign that hangs outside the restaurant's door, announcing the closure.

A Subway location in Georgia made light of the Titanic sub disaster on its sign (Amanda Butler via Twitter) ...