Cause you cant change every values and friction between steel and steel is a constant value of nature (~ 0.1431 ), I recommend to keep these values as given
I suggest to set the values a bit higher for engines with more than two cylinders (not articulated ones), for instance compound engines, in mind the characteristic oscillation of the traction forces is not so bad as in engines with two cylinders.
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Velocity dependent friction values. Used for mimicking internal friction and drag.
The values here allow friction calculation to change over two velocity segments
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Look for Joe’s tool and Add On, who describes precisely the matter
The derailment feature is tricked up in as much as when Derailments is turned on in the Options menu derailments are not turned on in the Sim until the speed limit is reached. If the speed limit is set high enough there will be no derailments. Why would they do such a thing?. The answer to that question is that with the default derailment force there are curves too tight, on ALL default routes, for the trains to be able to travel at the posted speed limits.
The most common derailment force used in the default rolling stock is about 0.25G (2.5KN per ton mass) this seems a low figure to me but I don't have any real world figures. To do any derailment force testing the route speed limit must be set to a low figure. I use 10 kph.” (James Hart)