Bore hole drilling machine (DDW-600) DDW-600 drilling rig is the integral steel-tracked chassis model with powerful mobile capability; advanced negative feedback 1  ... DW/TXS Construction Equipment (Beijing) Co., ...
Levitation. Maglev trains have no contacts with the rails while they move forward. They are levitated on the guide-way with the help of magnetic forces. Levitation is the process by which an object is suspended against gravity in a stable position without any physical contact.
The crew in the caboose kept an eye on the train in front of them to watch for hot-boxes (over-heated axle bearings) and other problems. Now there are trackside hotbox and dragging equipment detectors (automatic), and trains use roller bearings as opposed to the old friction bearings.he crew in the caboose kept an eye on the train in front of them to watch for hot-boxes (over-heated axle bearings) and other problems. Now there are trackside hotbox and dragging equipment detectors (automatic), and trains use roller bearings as opposed to the old friction bearings.