Probably your best bet is to try to latch on to an old timetable which every
now and then becomes available from a collector.
I am not in the process of disposing of anything at present although down
the road ahead, I may need to cut some of my stuff.
Check out the National Association of Timetable Collectors
Post Office Box 217
Bethpage, NY, 11714-0217
Don't expect something for free but they may be able to help you.
There are various collectors who are also dealers who might be able to
Go to a train show or as many train shows as you can, generally you can
find collectors who deal in paper items.
Finally, if you still have no luck, check out magazine adds, there is also a
"railfan timetable" likely available, I think I have seen them mentioned
Do not expect the railroad or their employees to help you, it is not too
likely that they will.