'adhesion' is..

[cabforward]

who understands the adhesion of a loco to the railhead? the trains glossary says it is how well the loco grips the rail.. if a loco is designed correctly, does this change over time? if a rail is worn or has other problems, adhesion would change.. does adhesion change for keeps or can it 'come and go'?

industrial discussions are technical and mostly math formulas and physics of substances..

is a slipping wheel a sign of loss of adhesion?

besides the wheel, the weight on traction axles and the railhead, are there other aspects of adhesion to be considered (that can be understood by non-geniuses)?

[cabforward]

who understands the adhesion of a loco to the railhead? the trains glossary says it is how well the loco grips the rail.. if a loco is designed correctly, does this change over time? if a rail is worn or has other problems, adhesion would change.. does adhesion change for keeps or can it 'come and go'?

industrial discussions are technical and mostly math formulas and physics of substances..

is a slipping wheel a sign of loss of adhesion?

besides the wheel, the weight on traction axles and the railhead, are there other aspects of adhesion to be considered (that can be understood by non-geniuses)?

[Anonymous]

All I know is that when "adhesion," is lost and regained rapidly, I lose butt to seat adhesion and have to go back and pack iron and put my train back togeather. Adhesion good! Slippage bad!
Ken

[Anonymous]

All I know is that when "adhesion," is lost and regained rapidly, I lose butt to seat adhesion and have to go back and pack iron and put my train back togeather. Adhesion good! Slippage bad!
Ken

[Anonymous]

Wheel starts to slip when power applied to it is greater than it can pull or the wheel spins faster than the speed of train (does this make sense?)
That's loss of adhesion. In modern locos when wheelslip is detected, sand is applied automatically and power is reduced. Wheelslip usually is caused by wet rails (ice, rain, snow) or grade. but adding more weight to locomotive wiil help reduce adhesion. That's why cement is added to slugs -to improve adhesion.
I hope i did some good here.

[Anonymous]

Wheel starts to slip when power applied to it is greater than it can pull or the wheel spins faster than the speed of train (does this make sense?)
That's loss of adhesion. In modern locos when wheelslip is detected, sand is applied automatically and power is reduced. Wheelslip usually is caused by wet rails (ice, rain, snow) or grade. but adding more weight to locomotive wiil help reduce adhesion. That's why cement is added to slugs -to improve adhesion.
I hope i did some good here.

[mudchicken]

IronKen:

Your cousins out here in hi-rails tend to go nowhere fast when it rains and they don't have the luxury of sand (as we watch the tachometer climb into the red zone)....

[mudchicken]

IronKen:

Your cousins out here in hi-rails tend to go nowhere fast when it rains and they don't have the luxury of sand (as we watch the tachometer climb into the red zone)....

[Anonymous]

Hey mudchicken, on a side note, we just had a roadmaster get sent home and had to pee and blow. Seems that he copied track and time wrong, problem being that he was hauling some brass around when he did this. One of the heave duty officials asked to see his T&T and woops, went outta the limits. Bye bye! Bummer for him, he was a cool dude. Bad gig. On coming trains are unforgiving as you know.
One of my worst fears is to hear the infamous, "secure your train, the trainmaster will be there to talk to you soon with your relief crew!" from the dispatcher.
Ken

[Anonymous]

Hey mudchicken, on a side note, we just had a roadmaster get sent home and had to pee and blow. Seems that he copied track and time wrong, problem being that he was hauling some brass around when he did this. One of the heave duty officials asked to see his T&T and woops, went outta the limits. Bye bye! Bummer for him, he was a cool dude. Bad gig. On coming trains are unforgiving as you know.
One of my worst fears is to hear the infamous, "secure your train, the trainmaster will be there to talk to you soon with your relief crew!" from the dispatcher.
Ken

[Anonymous]

French or Latin; French adhésion, from Latin adhaesion- Date: 1624

steady or firm attachment
OR
the action or state of
OR
the abnormal union of separate tissue surfaces by new fibrous tissue resulting from an inflammatory process
OR
the molecular attraction exerted between the surfaces of bodies in contact

That is Adhesion.

If you have any other questions, like above .. please feel free to contact your local dictionary, or you may pick up a copy for yourself at a bookstore, grocerystore and many other local retailers.

[Anonymous]

French or Latin; French adhésion, from Latin adhaesion- Date: 1624

steady or firm attachment
OR
the action or state of
OR
the abnormal union of separate tissue surfaces by new fibrous tissue resulting from an inflammatory process
OR
the molecular attraction exerted between the surfaces of bodies in contact

That is Adhesion.

If you have any other questions, like above .. please feel free to contact your local dictionary, or you may pick up a copy for yourself at a bookstore, grocerystore and many other local retailers.

[Anonymous]

OK wise guy, nice one! Wi***hat I thought of that dictionary thing myself. I'm kinda a smartass ya know.
Ken

[Anonymous]

OK wise guy, nice one! Wi***hat I thought of that dictionary thing myself. I'm kinda a smartass ya know.
Ken

[David3]

I think every engineer would love to have good adhesion all the time[:D]. But unfortunately ya can't[:(!]. Basicly if you are going up a hill, or running in ice, snow, rain, or any precipitation you won't have good track adhesion.

[David3]

I think every engineer would love to have good adhesion all the time[:D]. But unfortunately ya can't[:(!]. Basicly if you are going up a hill, or running in ice, snow, rain, or any precipitation you won't have good track adhesion.

[cabforward]

QUOTE: Originally posted by Alaskaman

Wheel starts to slip when power applied to it is greater than it can pull or the wheel spins faster than the speed of train (does this make sense?) That's loss of adhesion.

>> yes, it does. a wheel slips when the load is too heavy, or the engine is too lite..

adding more weight to locomotive wiil help reduce adhesion. That's why cement is added to slugs -to improve adhesion.

>> i don't follow this.. if a wheel slip is due to loss of adhesion, how will a heavier loco reduce it further? doesn't heavier engine = greater adhesion?

>> the next comment makes sense.. cement is added make the loco heavier to increase adhesion..

[cabforward]

QUOTE: Originally posted by Alaskaman

Wheel starts to slip when power applied to it is greater than it can pull or the wheel spins faster than the speed of train (does this make sense?) That's loss of adhesion.

>> yes, it does. a wheel slips when the load is too heavy, or the engine is too lite..

adding more weight to locomotive wiil help reduce adhesion. That's why cement is added to slugs -to improve adhesion.

>> i don't follow this.. if a wheel slip is due to loss of adhesion, how will a heavier loco reduce it further? doesn't heavier engine = greater adhesion?

>> the next comment makes sense.. cement is added make the loco heavier to increase adhesion..

[Anonymous]

Some of N&W's big Y class compounds had several tons of lead added to their frames to give them more adhesion.

[Anonymous]

Some of N&W's big Y class compounds had several tons of lead added to their frames to give them more adhesion.

[PNWRMNM]

PRACTICAL DEFINTION IS THE RATIO OF DRAWBAR PULL IN POUNDS TO LOCOMOTIVE WEIGHT. IF 250,000# UNIT PULLS 50,000 # RATIO IS 50/250 OR 20%. ADHESION ACTUALLY OCCURS WHERE THE WHEEL MEETS THE RAIL, AND IT IS A PHYSICS PROBLEM. SIMPLEST WAY TO SEE WHAT IT IS FOR A PARTICULAR UNIT IS TAKE PULL AT MINIMUM CONTINUOUS SPEED, WHICH IS LIMITED BY ADHESION AND DIVIDE BY WEIGHT AS ABOVE.

ADHESION IS VERY SENSATIVE TO ENVIRONMENTAL FACTORS. DRY RAIL IS ABOUT 25%. WET RAIL 17%. SAND ADDS 8%, SO SAND ON WET RAIL IS ABOUT EQUAL TO DRY RAIL. THESE FIGURES FOR DC TRACTION MOTORS. AC TRACTION MOTORS RATED AT 33%, PRESUMABLY ON DRY RAIL.

MORE WEIGHT DOES NOT GIVE MORE ADHESION, IT GIVES MORE PULL WITH WHATEVER ADHESION IS.

MAC

[PNWRMNM]

PRACTICAL DEFINTION IS THE RATIO OF DRAWBAR PULL IN POUNDS TO LOCOMOTIVE WEIGHT. IF 250,000# UNIT PULLS 50,000 # RATIO IS 50/250 OR 20%. ADHESION ACTUALLY OCCURS WHERE THE WHEEL MEETS THE RAIL, AND IT IS A PHYSICS PROBLEM. SIMPLEST WAY TO SEE WHAT IT IS FOR A PARTICULAR UNIT IS TAKE PULL AT MINIMUM CONTINUOUS SPEED, WHICH IS LIMITED BY ADHESION AND DIVIDE BY WEIGHT AS ABOVE.

ADHESION IS VERY SENSATIVE TO ENVIRONMENTAL FACTORS. DRY RAIL IS ABOUT 25%. WET RAIL 17%. SAND ADDS 8%, SO SAND ON WET RAIL IS ABOUT EQUAL TO DRY RAIL. THESE FIGURES FOR DC TRACTION MOTORS. AC TRACTION MOTORS RATED AT 33%, PRESUMABLY ON DRY RAIL.

MORE WEIGHT DOES NOT GIVE MORE ADHESION, IT GIVES MORE PULL WITH WHATEVER ADHESION IS.

MAC

[Mookie]

QUOTE: Originally posted by PNWRMNM

PRACTICAL DEFINTION IS THE RATIO OF DRAWBAR PULL IN POUNDS TO LOCOMOTIVE WEIGHT. IF 250,000# UNIT PULLS 50,000 # RATIO IS 50/250 OR 20%. ADHESION ACTUALLY OCCURS WHERE THE WHEEL MEETS THE RAIL, AND IT IS A PHYSICS PROBLEM. SIMPLEST WAY TO SEE WHAT IT IS FOR A PARTICULAR UNIT IS TAKE PULL AT MINIMUM CONTINUOUS SPEED, WHICH IS LIMITED BY ADHESION AND DIVIDE BY WEIGHT AS ABOVE.

ADHESION IS VERY SENSATIVE TO ENVIRONMENTAL FACTORS. DRY RAIL IS ABOUT 25%. WET RAIL 17%. SAND ADDS 8%, SO SAND ON WET RAIL IS ABOUT EQUAL TO DRY RAIL. THESE FIGURES FOR DC TRACTION MOTORS. AC TRACTION MOTORS RATED AT 33%, PRESUMABLY ON DRY RAIL.

MORE WEIGHT DOES NOT GIVE MORE ADHESION, IT GIVES MORE PULL WITH WHATEVER ADHESION IS.

MAC

What? [?] See this is what I have been trying to figure out for the past 6 mos. Still don't get it - but then physics wasn't my best subject. And the dictionary didn't help!

Mookie

[Mookie]

QUOTE: Originally posted by PNWRMNM

PRACTICAL DEFINTION IS THE RATIO OF DRAWBAR PULL IN POUNDS TO LOCOMOTIVE WEIGHT. IF 250,000# UNIT PULLS 50,000 # RATIO IS 50/250 OR 20%. ADHESION ACTUALLY OCCURS WHERE THE WHEEL MEETS THE RAIL, AND IT IS A PHYSICS PROBLEM. SIMPLEST WAY TO SEE WHAT IT IS FOR A PARTICULAR UNIT IS TAKE PULL AT MINIMUM CONTINUOUS SPEED, WHICH IS LIMITED BY ADHESION AND DIVIDE BY WEIGHT AS ABOVE.

ADHESION IS VERY SENSATIVE TO ENVIRONMENTAL FACTORS. DRY RAIL IS ABOUT 25%. WET RAIL 17%. SAND ADDS 8%, SO SAND ON WET RAIL IS ABOUT EQUAL TO DRY RAIL. THESE FIGURES FOR DC TRACTION MOTORS. AC TRACTION MOTORS RATED AT 33%, PRESUMABLY ON DRY RAIL.

MORE WEIGHT DOES NOT GIVE MORE ADHESION, IT GIVES MORE PULL WITH WHATEVER ADHESION IS.

MAC

What? [?] See this is what I have been trying to figure out for the past 6 mos. Still don't get it - but then physics wasn't my best subject. And the dictionary didn't help!

Mookie

[Mookie]

QUOTE: Originally posted by ironken

Hey mudchicken, on a side note, we just had a roadmaster get sent home and had to pee and blow. Seems that he copied track and time wrong, problem being that he was hauling some brass around when he did this. One of the heave duty officials asked to see his T&T and woops, went outta the limits. Bye bye! Bummer for him, he was a cool dude. Bad gig. On coming trains are unforgiving as you know.
One of my worst fears is to hear the infamous, "secure your train, the trainmaster will be there to talk to you soon with your relief crew!" from the dispatcher.
Ken

[:p] this is a Mookie challenge!

Roadmaster was tested for alcohol/drugs. He had some top officials on board the train. One of the top officials asked to see his (some body part) (test results)(time and temperature) and he was over the limit of whatever they looked at. He was fired probably permanently. He was one of the good guys. It is a bad thing. He was obviously where he shouldn't have been and could have had an accident with another train. The rest is in English.

So Ken - fill in the part I didn't get.

Martha Stewart - it is a good thing!

[Mookie]

QUOTE: Originally posted by ironken

Hey mudchicken, on a side note, we just had a roadmaster get sent home and had to pee and blow. Seems that he copied track and time wrong, problem being that he was hauling some brass around when he did this. One of the heave duty officials asked to see his T&T and woops, went outta the limits. Bye bye! Bummer for him, he was a cool dude. Bad gig. On coming trains are unforgiving as you know.
One of my worst fears is to hear the infamous, "secure your train, the trainmaster will be there to talk to you soon with your relief crew!" from the dispatcher.
Ken

[:p] this is a Mookie challenge!

Roadmaster was tested for alcohol/drugs. He had some top officials on board the train. One of the top officials asked to see his (some body part) (test results)(time and temperature) and he was over the limit of whatever they looked at. He was fired probably permanently. He was one of the good guys. It is a bad thing. He was obviously where he shouldn't have been and could have had an accident with another train. The rest is in English.

So Ken - fill in the part I didn't get.

Martha Stewart - it is a good thing!

[Anonymous]

ever been on wet rails with a locomotive that has the wheel slip circuit disabled. too see a shower of sparks spewing from all 6 axles when its dark is quite a spectacle

[Anonymous]

ever been on wet rails with a locomotive that has the wheel slip circuit disabled. too see a shower of sparks spewing from all 6 axles when its dark is quite a spectacle

[edblysard]

Mookie,
In plain english, the roadmaster copied his track and time incorrectly. T&T gives you permission to occupy a partcular section of tack between two given points or milepost, for a specific period of time.
He copied it incorrectly, and was outside the limits he was given premission to occupy.
Any opposing traffic could hit him.
Doing this knocks a rung or two out of the ladder to success!
The fact they made him do a drug test, and sent him home indicates they had a pretty good gripe with him, its rare for officals to rat each other out, unless there is a power struggle going on.
You have a copy of the UPs track and time warrant, it was tucked in the side of the folder I sent you.
Look it over, it will make sense quickly.
Stay Frosty,
Ed

[edblysard]

Mookie,
In plain english, the roadmaster copied his track and time incorrectly. T&T gives you permission to occupy a partcular section of tack between two given points or milepost, for a specific period of time.
He copied it incorrectly, and was outside the limits he was given premission to occupy.
Any opposing traffic could hit him.
Doing this knocks a rung or two out of the ladder to success!
The fact they made him do a drug test, and sent him home indicates they had a pretty good gripe with him, its rare for officals to rat each other out, unless there is a power struggle going on.
You have a copy of the UPs track and time warrant, it was tucked in the side of the folder I sent you.
Look it over, it will make sense quickly.
Stay Frosty,
Ed