I 've found the reason! The early railroad-shovels are derricks too! They were simply constructed railway waggons with steam-boiler, engines and winches inside. In front of the waggon was the boom mounted, able to swing left and right. Without shovel it could be used as a crane. Later people didn't realeased, that newer cranes are "full-circled". So a little misstake exist until today!
Derricks are from the design of a hangman's gallows. The dictionary defines derrick "any of various devices for lifting & moving heavy weights" w/ no mention of rotation. A crane is "a device for moving heavy weights, having 2 motions, 1 a direct lift & the other a horizontal movement, & consisting in 1 of its simplest forms of an upright post turning on its vertical axis & bearing a projecting arm on which the hoisting tackle is fitted." A derrick crane is a derrick w/ horizontally movable arm.
I've never heard that definition. My understanding is that a derrick is any lifting machine with a boom that rotates on its base. There is no limit on how far it can rotate. A crane doesn't have to rotate but the boom has to be able to move. Since this does both it is technically a "derrick crane" but the railroads usually just called them derricks.
Well, some people mean, the earth is a flat disc, some mean, there is a god, but there is only the never ending universe, some mean, tractors must have yellow wheels...
Been there. We don't sit around at the railroad using Wiki all day to be sure we use correct terms for machines. Did you know that many of us railroaders still refer to regulating valves on the new locos as Feed Valves even though it's a regulating valve? I still haven't found a section on Wiki that covers railroad slang. For now, enjoy the movie of the 7020, keep searching on Wiki so you feel better, and I'll continue to monitor my feed valve on the locomotive before I depart the terminal.
I sure miss the Sufferin' Pathetic
SBSBallard 1 year ago
Great shot of a steam crane ,but the blond with the skinny legs walking around sure got my mind off the crane.
SuperSilvertrain 2 years ago
Both the crane and the blond have nice outriggers.
cpdraw 2 years ago
I 've found the reason! The early railroad-shovels are derricks too! They were simply constructed railway waggons with steam-boiler, engines and winches inside. In front of the waggon was the boom mounted, able to swing left and right. Without shovel it could be used as a crane. Later people didn't realeased, that newer cranes are "full-circled". So a little misstake exist until today!
remmidemmi01 2 years ago
Derricks are from the design of a hangman's gallows. The dictionary defines derrick "any of various devices for lifting & moving heavy weights" w/ no mention of rotation. A crane is "a device for moving heavy weights, having 2 motions, 1 a direct lift & the other a horizontal movement, & consisting in 1 of its simplest forms of an upright post turning on its vertical axis & bearing a projecting arm on which the hoisting tackle is fitted." A derrick crane is a derrick w/ horizontally movable arm.
westr 2 years ago
Well, may be you have right; but please search derrick crane at google-pictures! There you can find pictures with derrick cranes like I mean!
remmidemmi01 2 years ago
Very nice video! But its not a derrick! A derrick means, that only the boom can turn for 180 degrees!
remmidemmi01 2 years ago
I've never heard that definition. My understanding is that a derrick is any lifting machine with a boom that rotates on its base. There is no limit on how far it can rotate. A crane doesn't have to rotate but the boom has to be able to move. Since this does both it is technically a "derrick crane" but the railroads usually just called them derricks.
westr 2 years ago
Well, may be you have right; but please search derrick crane at google-pictures! There you can find pictures with derrick cranes like I mean!
remmidemmi01 2 years ago
The railroads refer to them as Derricks. That's just the way it has been for many moons
spcascades 2 years ago
Well, some people mean, the earth is a flat disc, some mean, there is a god, but there is only the never ending universe, some mean, tractors must have yellow wheels...
Go to wikipedia, look at derrikkran !
remmidemmi01 2 years ago
Been there. We don't sit around at the railroad using Wiki all day to be sure we use correct terms for machines. Did you know that many of us railroaders still refer to regulating valves on the new locos as Feed Valves even though it's a regulating valve? I still haven't found a section on Wiki that covers railroad slang. For now, enjoy the movie of the 7020, keep searching on Wiki so you feel better, and I'll continue to monitor my feed valve on the locomotive before I depart the terminal.
spcascades 2 years ago
We had one just leave our earea. from Denison railroad depo.
Draglineoperator 3 years ago
loud
actionLEGOs 4 years ago
Cool vehicle
1f5sda 4 years ago