Avia3481

I am very new to the forum thing. I came here because I am having an issue with the union rep at my depot. Here's my question. Is there a way to get into the shifter class outside my depot? The reason for the question is because I have been in my depot coming up on three years and for some reason it seems that I am being overlooked or forgotten about, and I always get the same answer "next class", then when I go to ask again I am told that I just missed one