Old parts diagrams/assembly drawings

[hawklan1701d]

Hello,
new to the hobby and tried searvching here to no avail.
looking for where to get info on older locos & rolling stock.
picked up some old stuff from a neighbor.
Not sure of the year as I can't find anything on them.
they are:
Bachman engines, item numbers on the blue plastic cases are
404615 EMD GP40 Diesel CP Rail #5015
404655 EMD F9 Diesel CP Rail #1455

I would love to find where i can reference older stuff no longer on Bachmanns pages as I also received a bunch of rolling stock from about the same time frame.
Thanks