I need a way to sell my train items

The only option for me is to use ships for them. Many times you need train items to send a ship

Or upgrade houses, remember it's alleged to be a building game 🤣 

Yes upgrade housing and also do cargo, airport and export deliveries. Alternatively don’t buy them coz that’s the only way up you get them

A level 19 city can't use pickaxes and lamps (I can only use screws and railwayman's hats). I also receive pickaxes and lamps as rewards in the mayor's pass. They occupy the warehouse, but I can't use them anywhere.

I reported the issue to support, and after three attempts, I received a response that they were analyzing the problem and would be working on it. This was a few days ago.