The XLS is in the sourceforge archive for pak64: http://simutrans.svn.sourceforge.net/viewvc/simutrans/pak64/vehicle/cars.xls
For the calculation of running cost, the maximum ability of cars to attach is considered. (The 614 usually gaos as double or triple units, almost never in realy live as units of four.)
Second: The speedbonus does not jump. Between those points linear interpolations is used. Thus in 1985 you will have about 120km/h for rail. The curve was done in such a way that it approximated the mean speed of the available engines (that was how the speed bonus speed was calculated before this file or when it does not exist.)
With the tigress at 450 km/h you need really a high speedbouns or you would get really excess income. If you make the speedbonus less, than your destroy the distiction between freight and high speed engines. Look at pak46.german. There is always a best engine, not matter how old or what consists.
A high speedbonus allows for passenger engines to have very high running cost. You cannot run freight profitable by a Br1034. And that is fully intended. (Look at the second tab of the spreadsheet. Some engines are not balanced using the passenger cars but slower cars.) How would make lower the running cost of high speed (which requires high power) make them more distinct?
About pak128 coal: You can make lots of money with three coal trains supplying one pwoer station. More (in relation) than in pak64. But making oil less profitable is ok with me (since you will have to transport large amounts anyway).
About the middle speed units: You could use trams instead. Most light rails use them. I could also offer some japanese EMU, I have them for 135 km/h in player colors.
Container cars are on my eternal todo list. Vilvoh did some, but the had soo many stray pixels and no player colors. I had prepared some other too, but was not too satisfied. Still speed would be like 140 km/h I think.
Cargo by plain is a nightmare. Some (medicine) has a speedbonus, while others do not. Either the plane can only transport these goods profitable (and people will complain, even if it is realistic). There should be also a trailer for steel in the pak. A mail trailer I have available. The freight of steel and paper are taken from reality. 32t is already really the upper limit, in reality such heavy truck are forbidden almost everywhere. 20t of paper is really a lot.
There are different challenges with freight. Once Gotthardlok did an (abstract) freight pak (all factories coloerd squared) that used really high production. There the challenge was not the money but to supply everything with the sheer amounts needed. (Some might say like pak128 iron chain ... ) It was challenging, but was not too popular then.
EDIT: some container cars. First length 8, would go best with the mail container. Second length 12, based on vilvoh and strongly edited afterwards. Steel trailer in player colors (but too long) is in pak64.german. Can be edited. With slight recoloring it may serve also for paper then. Mail trailer (also too long) is there too. As EMU I could offer the E233, with very high capacity but only 120 top speed. Intro would be 2007.