This was a real engineering feat as the height difference between the two ends is only 12.5 inches [32 cm], despite its length of 1,749 feet [533 m].
See oli tõeline insenerikunsti suursaavutus, kuna kõrguste vahe kahe otsa vahel on kõigest 32 sentimeetrit, vaatamata sellele, et tunneli pikkus on 533 meetrit.