For model railroad enthusiasts who are interested in finding 4x8 HO layout plans, there are several online resources, such as LayoutVision.com, Trains.com and ModelTrainGuide.com. They contain plenty of information on designing and building model railroad sets of various gauges and dimensions. They supply detailed plans for HO 4x8 layouts.
ModelTrainGuide.com has 10 different track plans for 4x8 layouts, along with lists of parts needed to complete them. The track plans on ModelTrainGuide.com are designed with Atlas' Right Track software, and they include the original .RAL files for the user's convenience. It also provides a link to AtlasRR.com, where the user can download the software.