<P> Bell codes or Buzzer codes ( US Communication Signal Appliance codes ) are a series of bells or buzzers used on passenger trains for communication between the driver and guard . </P>
<P> Bell codes or Buzzer codes ( US Communication Signal Appliance codes ) are a series of bells or buzzers used on passenger trains for communication between the driver and guard . </P>
what is the bell on a train for
what is the bell on a train for
communication between the driver and guard
communication between the driver and guard