Frelinghuysen Arboretum
No admission feeA 124-acre public arboretum with formal gardens, woodlands, meadows, trails, and a historic Colonial Revival mansion.

A nonprofit railway museum in Whippany, New Jersey, preserving state railroad heritage since 1965 with historic equipment and excursion train rides.
P.O. Box 16, Whippany, NJ 07981-0016 · Whippany, NJ
Founded in 1965, this nonprofit museum restores, preserves, and operates historic railroad equipment and artifacts from New Jersey and nearby areas. Visitors can explore steam locomotives, cabooses, passenger cars, freight equipment, and buildings such as a crossing shanty and a ticket office. The museum also runs seasonal excursion trains, including special holiday-themed rides. It is a member of the HeritageRail Alliance. The site notes that the museum is closed for the winter, with trains expected to return in 2027.
The closest stops to Whippany Railway Museum, ordered by straight-line distance. A few more like it, plus some different kinds of fun so you can build a full day.
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