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/rescues Steve (std Poodle) & Eydie (min Schnauzer)
2015 Jay Flight 27RLS (Camped: 102 nights 2015, 90 nights 2016)
2006 Ford F350 6.0 PSD, Lariat, 4WD, CC, LB, SRW, auto., Camper pkg.