Prerequisites: Before you attempt this tutorial, it is highly recommended that you have a general familiarity with the format of RailWorks XML files, and that you have had successful experience editing XML files. You'll also need a utility program, such as RW_Tools, that can convert RailWorks BIN files to XML format and save them back as BIN files.
1. Before you do anything, you'll need to back up the existing Kuju file that specifies the containers which the Mi-Jack Crane can load. The name of that file is US_container_crane.bin, and you can find it in the RailWorks Assets folder using Windows Explorer. Make a copy of the file and rename the copy something like US_container_crane.bin.original, so RailWorks will ignore it.
2. Start your file editing program. In RW_Tools, select Open RailWorks File from the File menu, navigate to the file shown above, US_container_crane.bin, and open the file.
3. The contents of the BIN file are converted to XML format and displayed in a new window. Scroll down through the file until you find the text shown below.
Notice that there are three similar blocks of information. This information specifies which container models will be used by the Mi-Jack crane. The only significant difference between each block is the name of the container model blueprint: Container_double_01.xml, Container_double_02.xml, and Container_double_03.xml.
4. Select the third block in the series.
Make sure you have selected the block with the exact beginning and ending lines shown above.
Press Ctrl+C (copy).
5. Set the cursor on the left side of the page just below the block you just selected by clicking all the way to the left of the text </BlueprintID>.
Press Ctrl+V (paste). A copy of the data block you selected in Step 4 (highlighted here in green) is pasted just below it (highlighted here in pink).
6. Now let's edit the new data block. Change "Kuju" to read G-TraX. Change "RailSimulatorUS" to read Trains. Finally, change "Container_double_03.xml" to read GX_Containers01.xml.
7. Using the newly edited data block as a "seed," repeat the copy-past-edit sequence nine (9) times. Sequentially edit each data block so the XML blueprint names read GX_Containers02.xml, GX_Containers03.xml and so on, through GX_Containers10.xml.
8. Save your modified file.
It's also a good idea to make a copy of the modified file. Using Windows Explorer, make a copy of the file US_container_crane.bin (which you just finished modifying) and name the copy something like US_container_crane.bin.modified.
Enjoy loading your new double-stack cars!
One final note. RailWorks loads containers in the order it finds them in US_container_crane.bin, the file you just edited. Therefore, the first three containers that will be loaded are the generic ones furnished with RailWorks. The new G-TraX containers will begin to be loaded after those. If desired, you can further edit the file to rearrange the order of the container information blocks. For example, you can intersperse the generic containers with G-TraX containers for variety.