So here's the graph of the functions you have just described:
As you can see, their curves are pretty similar, and they resemble a "flattened" sigmoid. I have some doubts about the last diesel constant you have stated though:
Quote:
(for diesels this was 30.99133)
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as it would be identical to the corresponding electric constant, and for a bell ratio of 0.20 (AheadSlow), it gives an XMM0 value of 6.94 instead of 11.26; on the contrary, the electric XMM0 value returned by your constant is 7.56, as espected.
Something to note about the other constants:
(3,913995+1)*7432,328*(3,913995)^2/559500≈(8,857989+1)*3086,243*(8,857989)^2/2387200≈1
Constants apart, what is weird about those routines is the absence of max_speed sim file setting as a parameter, and the big difference between the XMM0 values returned by them and actual speeds attained