Whenever I try to make a custom train in the quick drive menu, my game crashes and gives me the following error code:
You can get an Error if you use third party assets that have a fault. Sometime you start a Scenario and you get an error that the consist is unable to load some vehicles. That might be because the vehicle has a fault - I had that a few week ago when an update to one set of coaches broke another set. Try submitting a Ticket to DTG Helpdesk https://forums.dovetailgames.com/threads/reporting-a-technical-issue.31193/
As TSC is an open platform, it is prone to bad 3rd party assets. When making a QD consist, your whole "Assets" folder gets scanned for preloads, engine- and wagon blueprints. It is very likely you have a corrupt asset. Use the 50/50 method to locate the source folder. That means, remove half of the folders in RailWorks\Assets to a safe place (keep the Kuju\RailSimulatorCore folder though). If it still crashes, do the same again. If not, move half of the removed asset folders back and so on until you find the folder responsible. Then we can look what's wrong with it. (moving folders inside the same drive partition will only take seconds as there's no physical movement of data)