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Error MainLoop.cpp Exception at tick 4734: El escenario level causó un error irrecuperable.
Por favor, informe de este error al autor del escenario.

Error while running event level::on_train_schedule_changed (ID 125)
__level__/control.lua:230: attempt to index field '?' (a nil value)
stack traceback:
__level__/control.lua:230: in function 'condition'
__core__/lualib/story.lua:105: in function 'story_update'
__level__/control.lua:369: in function <__level__/control.lua:368>

https://pastebin.com/xUi44rZb

This error happens when the tutorial tells you to assign a train station to the locomotive, once you do, this error log appears and the tutorial crashes

Post the log, add the version to the title and describe how to create the error please, see 3638.

Ref.: 127479

Thanks for the report. Issue is now fixed for 2.0.42.