The correct answer is: A. Green light up and down
When shunting, if the load is moving towards the person signalling, the railway staff should give a green light up and down. This is to indicate to the driver of the load that they have the right of way and can proceed.
The other options are incorrect because they do not indicate that the load has the right of way. Option B, green light left and right, is used to indicate that the load should stop. Option C, white light left and right, is used to indicate that the load should proceed with caution. Option D, green light without any movement, is not a valid hand signal.
It is important for railway staff to give the correct hand signals to ensure the safety of all involved. By giving a green light up and down, the railway staff is indicating to the driver of the load that they have the right of way and can proceed. This helps to prevent accidents and injuries.