Not sure what you're after, but...
There's an Amtrac stop in Burns Harbor, IN, about 50mi east of Union Station. The Camp-Land RV Park is about 4mi from the Burns Harbor Station.
There's Yogi Bear's Jellystone Park near Fremont, IN about the same train ride from Union Station, but a bit further to the rail stop in Burns Harbor.
Sherm & Terry w/rescue Eydie (min Schnauzer) & Charley (std Poodle)
2015 Jay Flight 27RLS, GY Endurance (E), Days: 102 '15, 90 '16, 80 '17, 161 '18
2006 Ford F350 PSD, 4WD, CC, LB, SRW, Cmpr. pkg, Equal-i-zer 4-p, ContiTrac TR
Full timing: Some will think you're crazy, some will be envious, just enjoy the freedom!