Penetrating the mountain ranges to give the track an alignment that was as straight as possible by excavating 92 tunnels, 6 of them being more than two miles [3.2 km] long.
Et rööpad saaksid joosta võimalikult otse, kaevandati läbi mäeahelike tungides 92 tunnelit, neist kuus rohkem kui 3 kilomeetri pikkused.