Probably best to remove your E Mail address from the post above, unless you enjoy spam. The maps may be available through the EL historical society BTW.
There's three maps of Hammond Yard under the Illinois/Indiana section of the link I gave you. If thats not it a little more info on what you're after would help.
I live about thirty miles southeast of you, near the Hoosier Valley RR Museum.
Have a look at this link. Get the Chicago Division track charts and the ZTS charts. The ZTS charts have a pretty good layout of Hammond Yard and all tracks are numbered. Might pare it down a bit for you.