Tiro Diabolical Scoundrels ApprehendedFor some time past obstructions harebeen placed on the Jeffersonville Railroad The damage to the property of the company by accidenta caused by these obstructions has been considerable, and sereral persons hare been crippled.On Tuesday morning, the 2, A. M., train from Indianapolis was thrown from the track by aome kind of an obstruction placed on it. The perpetrators in this iostsnce were ciugbt. One of them is named Hubbard, sod he keeps s tavern near the epot. The name of the other we hare not learned. There is no doubt but their object was the robbery of the passengers, mails, and express.Since the shore we have obtained some further particulars. The second man's name is Ulmer. Both he and Hubbard are notoriously bad characters. They bear the reputation of being thieres and counterfeiters. The Railroad Comp soy had suffered great loss from accidents, and with the riew ofdiscovering the perpetrators employed aCnicsgo detect ire named Smith.Mr. Smith at once proceeded to Vienna, near which town the accidents bad occurred, and remained there three or four weeks, passing himself off as a sporting character with plenty of moQey. He played poker, drank whisky, bet on races, visited cock-piu, c., aadwithdt was very liberal. He got a Mr. Clark, of Vienna, to aaaist him in bis plans and iniaoduce him to allthe fast characters. Thus be made the acquaintance ot Hubbard and Ulmer. Smith always was in for any kind of mischief and rascality, and thus got the confidence of hie associates. To make the thing perfect, heproposed the organization ol an association, pretending that similar ones existed in Chicago and Indianapolis. The rose took, and the place of meeting was fixed in a room of Clark's bouse. At every meeting each member was bound to confess all the rascalities he bad practiced. By this means Smith learned that Hubbard and Ulmer