According to Facebook, They had a derailment while working Old Bridge Chemicals. I do not know if SA-31 or SA-03 works Old Bridge Chemicals so sorry for the lack of information.
All three symbols (SA3, 22, and 31) should still be around but I'm not sure if they are still on the same schedule. I haven't seen or heard anything on SA22 in months and a few of my pals tell me it's not a Monday to Friday train anymore? Idk.