he federal judicial system by way of mandamus pending ap- peal, or mandamus relief in the absence of an appealable orders 2. Stratton! St. Lads 8. W. Ry., 282 U.S. DI 51 S. . 8. 75 L.Ed. 135 (1930), Ex parte Metropolitan Water Co.. 220 U.B. 599, 9 .Ct. 600, 55 L.Ed. 575 (1911); Miner Eimkh. 236