The ground-observed pitch was higher than that played when the train was approaching then lower than that played as the train passed and moved away, demonstrating the Doppler effect (1845) Léon Foucault's namesake Foucault pendulum is first exhibited.
Titik pengamat di tanah menerima yang nada lebih tinggi dari yang dimainkan ketika kereta mendekati pengamat tersebut, dan melemah ketika kereta melewati dan menjauh, mendemonstrasikan Efek Doppler (1845) Léon Foucault dan pendulum Foucault pertama kali dipamerkan.