Traveling block

If Wiktionary has a definition already, change this tag to {{TWCleanup2}} or else consider a soft redirect to Wiktionary by replacing the text on this page with {{Wi}}. If Wiktionary does not have the definition yet, consider moving the whole article to Wiktionary by replacing this tag with the template {{Copy to Wiktionary}}. A traveling block is the freely moving section of a block and tackle that contains a set of pulleys or sheaves through which the drill line (wire rope) is threaded or reeved and is opposite (and under) the crown block (the stationary section). A traveling block is the freely moving section of a block and tackle that contains a set of pulleys or sheaves through which the drill line (wire rope) is threaded or reeved and is opposite (and under) the crown block (the stationary section). The combination of the traveling block, crown block and wire rope drill line gives the ability to lift weights in the hundreds of thousands of pounds. On larger drilling rigs, when raising and lowering the derrick, line tensions over a million pounds are not unusual.