Minecraft Immersive Railroading how to build a big boy locomotive

How to build a big boy locomotive in immersive railroading in survival. I recommend that you pay close attention to how I'd put it together.
The mod pack that I'm using is from technic launcher. It's a bit outdated so that means you would need to update the immersive railroading mod.
Here is the link to the mod pack. api.technicpack...
Highlight the link and copy it and then paste it into your tactic launcher search bar. Once you have downloaded the mod pack. On the tactic launcher click on the modpack options click on the open then it will open another window click on mods you will need to replace IR with the new IR. Here's a link to do so.
minecraft.curs...
Make sure you remove the old one or otherwise there will be compatibility issues.