Late one night in college back in 2013, Kevin Brock released a mod replacing the dragons in “Skyrim” with Thomas the Tank Engine. The swap turned into a viral meme, as fans and famous YouTube creators, like Felix “PewDiePie” Kjellberg, played the altered game with fire-breathing locomotives. Brock’s mods for “Skyrim,” under the moniker “Trainwiz,” helped him land a job in game development at Human Head Studios in Madison, Wisconsin. Brock says the mods were a great conversation starter in the interviews. Nowadays, Brock, 27, still lives in Madison and he’s developing his own open-world space game.