`W` Board
Ø A yellow rectangular
board with letter “W” in black
Ø Will be provided at
places where the LP is required to whistle
Ø Normally, this is
provided at vulnerable places like Tunnels, Bridges, Curves and cuttings and
places of poor visibility etc.
Ø LPs to whistle
continuously from this board until a clear
visibility of the line ahead is reached.
`W/L` Board
Ø It is a Yellow
rectangular board with letter ‘W/L’ in black 
Ø
Provided
at all unmanned level crossing gates and at manned level crossing gates
situated on a sharp curve.
Ø Will be placed at an
adequate distance from the gate.
Ø LPs are required to
whistle from this board intermittently
till they reach RW/L Board.
RW/L
Repeater Whistle Board
It is provided in
rear of all unmanned level crossing gates.
Loco Pilots shall
give continuous whistle from this Board
till the Level
crossing.
