Ohhh okay. I think I understand your problem. The leftmost workstation (the crafting bench) requires you to set the correct crafting recipe before allowing you to place items on it. In other words, you must approach, press Q once, or until you see a train icon on the leftmost square of the crafting bench UI. Only then will the crafting bench accept train-specific crafting items. Once all three item slots are full, you can craft with E. I apologize that this wasn't explained better before. Thank you for your feedback.