(a) Jurisdiction. Within 35 days from the date that a copy of the order or decision sought to be reviewed was served upon the party affected by any order or decision of the Commission refusing an application for a rehearing of any rule, regulation, order or decision of the Commission, including any order granting or denying interim rate relief, or within 35 days from the date that a copy of the order or decision sought to be reviewed was served upon the party affected by any final order or decision of the Commission upon and after a rehearing of any rule, regulation, order or decision of the Commission, including any order granting or denying interim rate relief, any person or corporation affected by such rule, regulation, order or decision, may appeal to the appellate court of the judicial district in which the subject matter of the hearing is situated, or if the subject matter of the hearing is situated in more than one district, then of any one of such districts, for the purpose of having the reasonableness or lawfulness of the rule, regulation, order or decision inquired into and determined. The court first acquiring jurisdiction of any appeal from any rule, regulation, order or decision shall have and retain jurisdiction of such appeal and of all further appeals from the same rule, regulation, order or decision until such appeal is disposed of in such appellate court.