A Mexican transportation company Tuesday agreed to buy Florida East Coast Railway Holdings Corp. from the private equity group that acquired the historic railroad 10 years ago. GMéxico Transportes S.A. de C.V. (GMXT), a unit of Grupo Mexico, said it is buying FEC from funds management by Fortress Investment Group LLC in an all cash deal. The amount of the sale was not announced, but several news reports put the value of the deal at $2.1 billion. FEC is a 351-mile rail line running from Jacksonville to Miami The company did not say how the acquisition will affect operations of...