Hi all,
It is normal practice on the Railking engines to use the same sound file on all the engines in a production run regardless of road name. They might have done something special for the "Cat" engines, but they might not. It's not uncommon for MTH to only post the sound file on one engine (usually with the lowest product number) for that production run if the sound file is shared. I suspect that all the Railking Scale production runs from '03v1 and '06v1 shared the same sound file. Here is a link to that file:
r022pf3sd45___all040924afin.mth
^^^^^^^^^^^^^^^^^^^^^^^
JOHN... USE THE ABOVE FILE!!!
The first Railking Scale SD45's were cataloged in 2003v1 but didn't ship until October '04. There were a few changes made to the frame for PS2 and the shell was modified to add a smoke unit. Changes like this usually slow down the delivery. In this case, that resulted in the engines shipping with 3 volt boards instead of 5 volt. As a result, you can use the above sound file in any 3 volt engine ever produced, including John's engine.
Marty brought up the issue of the 3v2x boards with 2 megs of memory rather than 1 meg. Some sound files created for 3v2x engines were still less than 1 meg in size and could be loaded onto any 3 volt board. Unfortunately, that's not the case with the more recent Premier SD45 sound files. They are 1.2 megs and cannot be loaded onto John's engine.
Originally posted by: Rich Montague
Remember, "sound" files actually are operating files that control things like speed. And Railking and Premier SD45s are two different animals with different gearing. The Premier model has 3/2 trucks with three powered axles on each. The Railkings have the older trucks with the unpowered axle with blind idler wheels. There is a good chance that if you use the Premier sound file (which is excellent, by the way), the speed and other features in your engine may be off.
All MTH diesels have the same wheel diameter (.890 in.), gear ratio (10.5:1), and number of stripes on their flywheel (48). As dvbull observed, you can swap diesel files at will without altering the speed map. The Proto 3/2 trucks have extra idler gears compared to the earlier trucks, but this has no effect of the final drive ratio.