Erie Train # 6 detour with O&W 503 to Jersey City. This train went from the Erie;’s Middletown (DW) Yard via the main line to Goshen. The train then took the Erie’s Montgomery Branch to Campbell Hall. The train would then cross the O&W diamond with the Montgomery Branch and back via the interchange track to the O&W Main line. The other possibility was to enter JM off the Montgomery Branch into CNE t/ NH trackage and then back onto the O&W via the O&W switch to connect with the NH to the O&W’s main line. The train then proceed over the O&W to Cornwall and onto the West Shore to the NYS&W at Little Ferry. From there it went over the NYS&W to Jersey City with most likely NYS&W pilots. Erie Pilots would have been required from Middletown to Campbell Hall.
More info http://ontarioexpress.org/2016/06/middletown-railroad-day-2016/