ya, Chairman RB, said that around 50% coaches turned to isolation wards will be back into service as of now. Rest will remain for sometime. I don't think will introduce 2 tier SL, but yes, they have started booking for GS coaches (as 2S), & only bonafide pax to enter stations, so it can be said that pax not more than no. of berths will be present (obviously RAC will be extra).