what is limited slip axle?
137827
Your answer is in your question.  It limits the amount of slip from one wheel and transfers the power to the other wheel.
182693
I'd say it would be a 2nd class lever- you exert the force on the end, the load is out in front, and it's moving where the pivot would be. Source URL looks stupid but is good explainer.
289473
Can for the body.\n\nbolts thru the can body for the axles.\n\nlarge washers for the wheels.\n\nNuts to hold the washers in place.\n\nStretched rubber bands for propulsion.
282311
a lever, a wheel, a pulley...
190398
According to the ref., the taper (actually a hyperbolic curve) is about taking curves. The taper increases the diameter of the wheel toward the flange. Since trains use a solid axle, both wheels on an axle rotate at the same speed. Because of centrifugal force, the wheels shift slightly toward the outside of the curve. Since the flanges and the larger diameter section are on the inboard side of the wheel, the shift increases the outer wheel's effective diameter and decreases the inner wheel's effective diameter. So the taper allows the wheel diameters to change to compensate for the unequal distances they travel around the curve, which reduces wheel slippage and wear. This also tilts the truck slightly to the inside of the curve which helps counteract the tendency to roll to the outside of the curve. \nI haven't been able to find any information on how the amount of taper relates to track curvature, but the ratio of outer to inner wheel diameter on any curve ideally would equal the ratio of outer to inner track radius of curvature.
1031821
A vehicle's wheels rotate at different speeds, especially when turning corners. The differential is designed to drive a pair of wheels with equal force, while allowing them to rotate at different speeds.\nbut in trains we do not generally do not find steep corners as they are not suitable to lay the tracks.
539535
I'm not sure what a short distance traction application is, but I do know that a series DC motor(virtually) has an unlimited  amount of torque, and will spin out of control unless there is a load on it.  It must be directly coupled to it's load or it will self destruct.
233488
What you are looking for is called a "curb ramp" or something along that idea.  You can find them through many places that deal in RV's or boats.  Otherwise, if you can't find them locally, you can find them through Northern Tool & Equipment.  It is item# 143095.  They are a nation wide company and will ship across the US.  They can be found online at http://www.northerntool.com or you can get in touch with them by calling 1-800-221-0516.  Good luck in your seach.
435404
This is a function of vehicle weight and suspension and road characteristics. EALF is the ratio of road damage (or inverse ratio of pavement life) on a specific road with a specific loaded vehicle compared to a standard loaded axle. The ref. gives an example of the analysis used.
81945
<Four wheel drive, 4WD, 4x4, all wheel drive, and AWD are terms used to describe a four-wheeled vehicle with a drivetrain that allows all four wheels to receive power from the engine simultaneously. While many people think exclusively of off-road vehicles, powering all four wheels provides better control on slick ice and is an important part of rally racing on mostly-paved roads.\nFour wheel drive (4WD or 4x4 for short) was the original term, often used to describe truck-like vehicles that required the driver to manually switch between a two wheel drive mode for streets and a four wheel drive mode for low traction conditions such as ice, mud, or loose gravel. The "all wheel drive" term (AWD for short) was invented to distinguish vehicles that are capable of driving all four wheels on normal roads without causing poor control and excessive tire and drivetrain wear. Most modern AWD vehicles do not continuously drive all four wheels, but instead switch from two wheel drive to four wheel drive automatically as needed.
1036190
If your refering to using a larger drive than needed for the application. Then I would say only limited by your cost and if the drive can be adjusted to the motor/load you are trying to use.
271766
no they have what some people call them half shafts or cv axles
275275
specialty tool available from the dealership
128489
either a spring/shock combo or coilovers.  be careful that the tires don't rub too much.
938764
you need harder wheels and a higher ABEC bearing for them.:)
646715
Its available. R-12 & R-22 are restricted by the EPA and being phased out.
39411
Crank shaft with a bigger throw and shorter conecting rods.