Which transformers series featured the robots in the future; where they are always robots; one plays tank?

The settings were usually dark and in like a city surrounding. It may or may not have been transformers but it was really like it. I'm pretty darn sure it was transformers. It had one group of robots attacking another group of robots that were all sent to the future. Instead of transforming into cars or animals they transformed into futuristic military vehicles.Which transformers series featured the robots in the future; where they are always robots; one plays tank?Beast Machines. Set on a conquered Cybertron with dark cities and underground tunnels. The good guys were animals (Maximals) always being hunted by the bad guys, who were vehicles (Vehicons). The tank, or leader of the tanks, was named Tankor. Other Vehicon leaders were Thrust (motorcycle), Jetstorm (jet), Nemesis Strika (6 wheeled tank), and Obsidian (a double copter)

Beast Machines was the follow-up to Beast Wars

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