I watch the "Virtual Railfan" youtube channel now and then and some (quite a few) of those trains have cars with wheel bearings just screaming from being worn o

I watch the "Virtual Railfan" youtube channel now and then and some (quite a few) of those trains have cars with wheel bearings just screaming from being worn out. There are also videos of trains derailing where you can see those failing and cars piling up and tipping over. I grew up in the 60s-70s with railroad tracks less than 200ft from our home and rarely ever heard wheel bearings screeching like that.