The first railroad crossed you went wasn’t the actual model And the reason it sounds like that is because its SSSR A buzzer like bell in a Czech and Slovakia was apart of USSR during WWII so they made Railroad crossings with each other’s equipment making SSSR or CSSR SSSR or CSSR crossings have these bells that are distorted and thats because they have these buzzer like bells here the link to the vid btw ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-YUXClRzIPlA.html so no its not a fire alarm