I'm a car nut, so to me certain cars are the perfect marriage of art, science and precision engineering: something that only becomes truly apparent once they're driven - something to be enjoyed by all 5 senses (well, maybe not taste).
1962 Yorkshire diesel locomotive
1953 Diesel electric locomotive
1950 Talgo II engine
1950 Talgo II wagon
1923 Electric locomotive
1887 Steam locomotive ‘Pucheta’
Museo Ferrocaril, Madrid, Spain