With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: The United Kingdom includes America.
text_B: Heberlein brake is a continuous railway brake used in Germany that is applied by means of a mechanical cable .. railway brake. railway brake. Train braking is therefore initiated centrally from the locomotive using a winder .. locomotive. locomotive. This causes the brake clips to be applied on individual wagons , assisted by a servo system which makes use of the rotation of the axle .. servo. Servomechanism. The brakes operate automatically if the cable snaps .. A typical feature of Heberlein brakes is the clearly visible cable run on top of the wagons , but cables can also be led underneath the wagons , as on the Spreewaldbahn railway line .. Spreewaldbahn. Spreewaldbahn. Heberlein brakes were eventually largely replaced by compressed-air brakes or , sometimes , by vacuum brakes on narrow gauge railway vehicles .. compressed-air brakes. compressed-air brakes. vacuum brakes. vacuum brakes. narrow gauge. narrow gauge
not_related.