The Quaker City has at last determined to try for herself the experiment which has been so successful here and in other places, namely, a city passenger railroad. It is to run along Sixth street, and men are now at work laying down the tracks, much to the disgust of some, and approbation of the remainder of the inhabitants. The quiet Philadelphians are much astonished at the proceeding, and their newspapers say that hundreds of spectators are there at all hours of the day, looking larnestIy on. Should this one prove successful, many others are to be laid. The cars will " prove a great convenience to the inhabitants J and business-men living in the suburbs and S doing business in the city.