In addition to these improvements, several new routes were included, such as Hawes Junction (representing a small section of the Settle and Carlisle Railway and serving as a demo for TC3), Toronto Rail Lands 1954 (representing Toronto's sprawling railyard in 1954), and Marias Pass Approach (representing the BNSF Marias Pass line between Shelby, Montana and Cut Bank, Montana and serving as a demo for the full Marias Pass payware route). This important filtering feature was further improved in Trainz 2009, becoming far more powerful and easier to use. By defining a good filter, the user could 'selectively not see' the clutter of regional items in the Surveyor asset selection menus saving user time when world building. ContentManager.exe (now called just CM) combines data base management, and secure FTPupload and download facilities and special user definable filters all in one integrated system. Trainz Railway Simulator 2006 (known as Trainz Railroad Simulator 2006 in the USA), or TRS2006, was an transitional release, incorporating the stable Auran JET based TRS2004 GUI modules with only some graphics improvements, but introducing the data base manager Content Manager Plus (CMP) as a new core technology. These 'toylike' animated 3D models eventually led to My First Trainz with its simple child-friendly simulator game interface. It also was the first Rail Simulator to include Thomas & Friends and to emulate 'wooden toy train' snap together modeled content-all of which was later available in Trainz 2006 and up.

There were many industries included and much of the bundled rolling stock was updated to include this new dynamic loading and unloading animated capability with a corresponding load-state dynamic driving physics change in the handling of a consist.

It has an iconic status in the Trainz community as once the bugs were worked out of it, its feature improvements have been the look-see-and-feel of all the Trainz releases since regardless of how things are reskinned.

Trainz Railroad Simulator 2004 was the first version of Trainz to include interactive industries and loadable rolling stock capabilities, which allowed the player to deliver various resources (such as coal, wood, and steel) and passengers to various industries and stations across the playable area.

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