Classification yard#Hump yards

The hump (also flow back, flow Hill, donkey or rare Rangierberg in Austria Rollberg ) is a usually artificial hill, over which runs a track. In larger flow systems are often two mountain tracks available. Humps are to be found in marshalling yards and some goods, factory or port stations. They are used for draining or imprints of freight cars that are sorted in this way according to their destinations.

The shunting cars to be driven up by a switch engine on the hump and disengaged on its tip at the required places. You then roll, individually or in small groups coupled together and driven by gravity, independently down the slope and get to their destination stations sorted according to the classification tracks the direction group. They are ( in mechanized marshalling yards after Vorbremsen using a retarder ) collected in the destination track either with wheel chocks and stopped or taken over by an automatic conveyor system and dome ripe introduced to stationary vehicles.

The then usual plain bearings deteriorating the running characteristics of the car especially in extreme cold noticeably. The reason for this was primarily the fact that the oil in the Gleitachslagern in the cold season was much tougher and the car therefore had a higher rolling resistance. To compensate two humps were side by side created earlier in many cases, the summer mountain was used in warm weather and of about 0.5-0.8 m higher Winterberg in cold weather.

The running of the car on the hump is regulated by the Abdrücksignal, but this is redundant in modern automated marshalling yards.

As bad runner rail cars are referred to only reach a relatively low speed when maneuvering over a hump, and thus stand still in front of the intended target.

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