Albuquerque leaders say the next Rail Trail phase will connect Old Town, the BioPark and the Bosque as part of a planned 7-mile loop. ALBUQUERQUE, N.M. – Albuquerque leaders say the next Rail Trail phase will connect Old Town, the BioPark and the Bosque as part of a planned 7-mile loop. The city said Tuesday the next phase will connect the Sawmill District to Old Town as leaders continue work on the larger trail plan. Some people had cars and vehicles there, just a bunch of weeds and not used,” said Neri Holguin, a West Old Town neighbor. “It might even encourage getting active, healthier lifestyle and an easier route to Old Town.”