If it's hired to RCC, why do you class it as ELL? We use the operators on Trainspo, as much as possible, not the leasing companies (except for when the loco is not hired to anyone).
There is a company RCC Bulgaria, which is registered in Bulgaria, but as I know the their locomotives are with the registration of ÖBB. And I'm not sure which company is hired this loco - ÖBB, Rail Cargo group or RCC Bulgaria. It is serving trains of RCC Bulgaria.