I feel your pain...the only shred of hope remaining is to average down at the rock bottom and get maybe a 10% bounce. We are not there yet obviously. Forget thinking that over time the dividend will recoup your losses.
It will be reduced or eliminated soon. Let's hope at least...I'd hate to see them prop it up with debt or new offerings when ultimately it will be pulled.
Wait until the mid-30's and then begin to start buying some. Do not even think of buying a single share before earnings. It might be tempting, but turn off the computer and walk away. Next week the bomb of bad news will be unloaded. In this market, NS will be punished beyond comprehension.
When the dust settles, it's time to step up to the plate. Time to start the weekend early.