I know there's a lot of people who like a particular content producer for Trainz, and I'm fortunate to have tried several content pieces from different sites. I'll be comparing the various ones so others can make an informed decision and newcomers to Trainz can find information about the content. First up is my favorite, RRMods. For long-term content reliability their content is in a class by itself. Some of the older ones may still have errors when used in newer versions of Trainz. But the majority of their content has had the errors fixed and is extremely reliable. For those looking to change a hornsound on an RRMods engine you won't have to worry about a thing. Besides being reliable their content is also quite detailed and as a bonus the newer content has a lot of detail.