Also noise and ride comfort. In Warsaw we have some really old Soviet subway cars and a mix of western/homegrown ones While the bumpy ride is just a nuissance,

Also noise and ride comfort. In Warsaw we have some really old Soviet subway cars and a mix of western/homegrown ones While the bumpy ride is just a nuissance, the noise of those old junkers probably should require everyone to wear heavy hearing protection, if one had to adhere to workplace regulation. When their crooked boogies start to screech and grind in turns, the noise is physically painful