Before railroads were built, all freight and passengers were transported by teams of from 10 to 16 horses or mules. Ore was hauled to the mills by these teams, which also brought to the mines all the lumber required for construction among other things. Teams also hauled over the Sierra all the mining machinery, all supplies required by both mines and mills, as well as goods and merchandise needed by the stores and businesses. Each team hauled trains of two to four wagon loads. When the large reduction works of the Ophir Mining Company were in peak operation, lines of teams from one to three miles (5 km) in length moved along the wagon roads, and sometimes blocked Virginia City streets for hours.