For reference I am talking about ones on CN and CP, I don't know exactly what they do. I know that they are 100 feet before a RR Crossing, interlock or bridge, but sometimes the signs look different as they either have two signs or have arrows pointing on the left or right, I also heard it had something to do with snowplows, I really don't know what they do, does anyone know what flangers do and what the different variations mean. I took a screenshot as RRmods made CN/CP signs that have flangers, so people can get an idea what I am talking about