Wikipedia
Gooiboog
The Gooiboog (Dutch for Gooi Curve) is a railway chord which links the Dutch Flevolijn and Gooilijn railway lines.
The link is double tracked. The outer, southbound line is 2200 metres long, the inner northbound one is 1400 metre. The outer track is in a dive-under, running beneath the surface level for about 1500 metres, diving underneath the Gooilijn.
The Gooiboog offers a direct link between Almere, Hilversum and Utrecht.