ZecRail mentions downloading ".rar" files (like the "VR DD Class Type 1 Pack") for use in the Trainz Content Manager. These are typically payware or community-created, involving complex locomotive models with custom weathering and scripting.
(A gaming forum, a tech support page, or a download site?) Once I know, I can find the specific story behind the file! VR DD Class Type 1 Pack - ZecRail D Series 4.rar
If you were looking for a specific gaming mod or technical tool, the BeamNG or Trainz options are the most likely fit for a "4.rar" naming convention. To give you the most relevant blog post, could you tell me: ZecRail mentions downloading "