1. The Soviet Union’s Railway-Based Intercontinental Ballistic Missile Had An Inflatable Nosecone The Soviet Union was the only country to field a fully operational rail-mobile ICBM and it …

2. They fashioned auxiliary wooden tail fins to keep the torpedoes horizontal, so they would dive to only 35 feet, and they added a breakaway "nosecone" of soft wood to cushion the impact with the surface of the water."