PHILADELPHIA — A second bus carrying immigrants from Texas arrived in Philadelphia on Monday morning, a twice-in-six-days sequel that propelled the city to offer fresh welcome to more weary, uncertain travelers from the border. Immigration advocates said the bus with an estimated 48 Spanish-speaking passengers was sent here by Texas Gov. Greg Abbott. The bus landed outside 30th Street Station in freezing temperatures, welcomed by more than 20 immigrant leaders, city officials and volunteers, some of whom had waited hours to help provide a greeting. They immediately handed out blankets and, to …