When we get on train or bus, we can reach the destination without worrying. Because the conductor definitely announces next station. In the case of train, not only the destination but also next transfer or the number of platform for transfer is announced each time the train is approaching next station. I think that this service is only Japan. Besides, the conductor explains the manner in the vehicle.
And we can hear the announcement for the arrival of the train at the platform.
Is it polite? You might think that the service isn’t necessary. But this service is convenient for passengers. Because there are a lot of lines ands train in especially Tokyo is very complicated, we need these instructions.