Why-a no-a chicken?
You can play bridge, never come across a game called viaduct.
Is this via-duck the same as a quack-we-ducked ?
Duck-a you head! Lola Brigida![:p]
tree68 - I like it !!![:D]
My favorite bridge, RR bridges, URR trestles, elevated overpasses,
and a foot bridge to boot:
http://www.railpictures.net/viewphoto.php?id=124937
Dave
So is an SD45 locomotive both an engine and a motor?
It’s a locomotive!
[:p]
Loco = Meaning Crazy
Motive = Reason for doing something…
(my [2c] worth
kofy
Re up829 posting.
What is refered to as the Cartier bridge is actually the Jacques-Cartier bridge. This 1937 feet-long bridge was inaugurated in 1932 under the name “Pont du Havre” and renamed in 1934 in honor of the Discoverer of Quebec (1534).Originally it carried 2 tramways tracks and a roadway. In 1957 it was jacked up about 50’ to increase the clearance for the ships moving along the St.Lawrence Seaway and/or accessing Montreal Harbor. The 6592 feet-long Victoria bridge is actually the main railroad bridge connecting Montreal to the St.Lawrence River South Shore and from there the Quebec Eastern Townships and North-Eastern American States. The first Victoria Bridge was a huge metal tube designed by Robert Stephenson and was inaugurated in 1860 by the Prince of Wales, son of Queen Victoria in honor of whom it was named. The bridge was entirely rebuilt in 1898 and its tube replaced by 23 steel trestles resting on the original 24 piers and supporting 2 railroad tracks in their center plus a single-lane roadway and a sidewalk on each side: basically this is still the bridge in daily use. To accommodate the traffic in the St.Lawrence Seaway two vertical lifting spans were built near the South Shore end of the bridge in 1958: these additions look like a Y from the air and within the legs of the Y you can see the St-Lambert lock which is the last one on the Seaway in the direction of the Atlantic. (Information taken an official Quebec Ministry of Transport publication, undated and uncopyrighted as far as I can see…)
pneumatic and hydraulic “motors” are actually impellers driven by air or fliuds
and users of energy from either a motor or a engine but do not generate power
unless one would care have a Rube Goldberg, such as a electric air compressor
run an air drill to turn a generator/alternator to produce another electric current
to run a fan to keep one cool while the air drill heats up in your hand.
I would call a viaduct a fixed structure, usually with several spans, that crosses an extended topographical depression such as a valley. A distinguishing characteristic of a viaduct, aside from crossing the depression, is to maintain a steady grade. Thus the Romans, through superb engineering, delivered water many miles over their water viaducts because they were able to build with a constant grade of less than 1%.
Well out here in Oregon we dont have viaducts that I have heard of!! On the “hill” here we have bridges of all kinds and one trestle that is curved over Oregon Hwy 58 ( the hwy I live on) and Salt Creek to take the tracks back westward and up the hill again. It is something to be driving uphill on 58 and see the UP going over your head on what seems to be a spider web!!! And if you are ever out this way to see the bridge at MP 545 os so that seems to be hanging on the side of the cliff by bolts??? Wow!!!
I’ve always vvundered the same thing
In common (dictionary) useage, a viaduct is a series of spans or arches, carrying trains, vehicles, water, etc. It can be built with stone, concrete, steel, or whatever. Nevertheless, it is interesting to notice that in Clement C. Williams’s Design of Railway Location (copyrighted 1917 and 1924, and used as a college railroad engineering textbook), makes no mention of viaducts; bridges and trestles, yes, but not viaducts. This suggests that perhaps it may be best to avoid using “viaduct” in a railroad context.
Tell that to the New York City Transit Authority!
“What does a chicken have to do with this?” “Well, boss, I ain’t had a meal inna four days, a chicken would do reeel nice righta now!”[:o)][;)]
Using 2500 year old technoligy the romans built a system of canals and viaducts that dropped only 56 feet in 30 miles and yet delivered over a million gallons of water a day. Not bad for no lasers or motor power. A bridge can be as simple as a plank across a stream and on up from there but a viaduct requires at least one arch to support it. [2c] As always ENJOY
Here in Seattle we have the Alaskan Way Viaduct, which they are now trying to figure out how to fix or replace, due to earthquake damge, and wear-and-tear. Smart, huh!!
It is a double-decker elevated highway, that is a series of short spans of concrete reinforced bridging. The double-deck, not so great for earthquakes, but it is basically just a series of bridges, or one long one, with many spans.
I’ve always thought that the differrence was whether it spans water or land. A bridge spans a river or lake, a viaduct spans a valley or depression. In Milwaukee, we have many viaducts that cross over the Menomonee valley. But in doing so, they also cross the Menomonee River. They are viaducts then because the majority of their span is over land? Then there is the HighRise bridge(I94/I43 over the same valley) and the Hoan Bridge(I794, also over the same Menomonee Valley) but they are called bridges.
The aqueducts carried water over land, so that would seem to reinforce my thinking. As long as we are studying etymology, there are bridges in lots of other terms. I use bridge clips to connect binding posts together. Some digital cameras use a ‘PictBridge’ to connect to a computer. The term ‘bridge’ seems to be generic for ‘connecting’. I would submit that a bridge connects things, binding posts, peripherals, sides of a river or other ‘gap’ in level terrain, or sections of a roadway or railway, while a viaduct is the path, the thing itself, rather than a connector of two things.
I have a feeling that these structures are called what people prefer to call them. Most of the bridges and viaducts are named. Those names were chosen by politicians. Since when do they know what they are talking about?!!!
I would agree.
Based on the definitions I’ve heard, Chicagoans almost always use some terms wrong. A “viaduct” here is what’s called any old plate-steel bridge (sans trestle) that carries RR ROW over a vehicular street.