Visit TopoQuest and review a topographical map of the Belvidere, New Jersey area. Print a copy of the map to use as guidance when you reach the rail lines. Topographical maps of New Jersey are also available through online booksellers like Amazon or major bookstores in the tri-state area. Bring your map(s) with you to the tunnels.
Walk toward the junction of Manunka Chunk Road and Market Street. Look for the Manunka Chunk rail line a few yards north of Manunka Chunk Road. Walk onto the track and follow it in a northeasterly direction. The track will lead directly into the Manunka Chunk train tunnels, which are located to the northeast of Belvidere, New Jersey.
Take the Holland Tunnel into New Jersey from midtown Manhattan. Drive west along NJ-139 to NJ-7/US-9 west. Continue west on I-280 west, which turns into I-80 west. Exit I-80 onto Route 46 south to Manunka Chunk Road. Turn right onto Manunka Chunk Road and drive to Market Street. Turn right onto Market Street and park your car. If you are traveling from a location other than New York City, use an online route finder like Google Maps or MapQuest to determine the best route for you.