in this snapshot you are able to power what i assume an infinite amount of connected powered rails using two redstone torches by simply placing one at the beginning, and two another where redstone power goes out and remove the one behind and repeat the process

link to the video due to high file size: https://drive.google.com/drive/folders/1esb2cW2yZm8pZgQ8cC4KxM1xllGamhQI