(This is just a tiny rant but I do really like the game.)
The train boss is very annoying, even on Normal difficulty. The slam attack hardly has a windup and the hitboxes just feel too big/last too long. The tip to do the back attack doesnt really help cause there's projectiles crawling on the ground every time it does the slam attack. And the charge attack would be much more bearable if I could hook through the smokestack or if the hitbox was smaller. Also when it turns around I immediately get hit by it's face, get knocked backwards, it turns again, and I get hit and knocked back again.
I really enjoyed the Wraith boss, I still died a ton but it felt way more fair when I died. Even then I was eager to try again against it. With the Train, I feel like I'm just being juggled around. Again, I'm just nagging. Honestly the boss is fine, its just the reaction time needed to dodge things feels way more demanding than earlier parts. I did beat it on the first try on the lowest two difficulties but I feel like the jump from those to Normal is a bit much.