I have a somewhat odd, yet warranted, addition to make to our established library of games inhabiting the Dieselpunk genre. This addition is two of the games contained in the bundle, The Orange Box, developed by the esteemed Software Company, Valve. Those familiar with Valve will know it for its earlier games, Half Life and Counterstrike.
Half Life 2-Alright, strictly speaking this is a Cyberpunk title. Even so, there are multiple elements in the game that give it a distinctly Dieselpunk feel. HL 2 is set in a Dystopian world in which an alien force known as the Combine has forced humanity into submission. The humans encountered in the game are uniformed workers monitored constantly and harassed by the Watch when they are disobedient. The uniforms and decrepit buildings in this game draw up comparisons to George Orwell's novel, 1984, and seems to be directly influenced by the world described in said novel. For the Dieselpunks who enjoy the prospect of the Roaring twenties and Prohibition era New England and consider that to be the definition of Dieselpunk, you may not think this to be a game to necessarily fit the genre. For those with invested interest in the conditions in Russia/Soviet Union and its territories, this postapocalyptic game will harbor a sense of nostalgia all the while of producing an experience unlike any other game.
Team Fortress 2-The more obviously Dieselpunk of the two, this game has a retro style to it in terms of its music and design. In more literal terms, the locations and types of characters to choose from have a distinct Dieselpunk mentality. The locations, which include factories in a western setting, may sound out of place in a genre such as Dieselpunk, but, once you play it, you will have a more accurate idea of how it carries on in the aesthetic we all love.
Try them out and you will have an experience worthy of your time, whether you consider them to be Dieselpunk or not.