You will see a think about an authentication key. To disable this pop up, please use this by copying the command and pasting it in game. Before you start a singleplayer world, I advise you to wait until all the trains finish registering
Install Deluxe Railway Modpack
Step 1
Installing a modpack using the Technic Launcher is easy. If you don't already have the launcher downloaded, visit our download page to get the latest version.
Step 2
Type in the modpack name (Deluxe Railway Modpack) or paste the following url into the search box.
Step 3
Finally, click Install at the bottom right of the launcher after you select Deluxe Railway Modpack from the list on the left. The launcher will handle everything else!