There is another option (besides getting on the PRR from LV at Hunter) which the LV did before it built as far north as Newark.
Let's assume the B&O got on the LV (from CNJ) at Bound Brook. A few miles eastbound from there on the LV main at South Plainfield was a junction on the LV where the LV Perth Amboy branch (might have the name wrong) branched off . On the way to Perth Amboy it crossed under the PRR just west of the Metuchen station. There was a connection for sure between the LV on the way to Perth Amboy to the PRR in an eastbound direction (although eastbound traffic would have to cross over the usual westbound PRR tracks). The stub of this connection is still there on the PRR and used for MoW equipment storage, etc. This Perth Amboy branch was the LV mainline from PA (which went to Perth Amboy starting in 1975) before the extension from South Plainfield to Newark (which then became the main) in 1891. From 1875 to 1891 LV passenger traffic got on the PRR in Metuchen, and in 1891 the connection point was Newark (where the current mainline crosses PRR). I think that lasted a few years til LV built their own terminal in Jersey City.
JS
EDIT: just found this 1918 LV board of directors report, which says that on April 28, 1918, B&O trains started running on the LV between Pt. Reading Junction (near Bound Brook) and Newark Junction to get on the PRR to go to its NY station. So ExCon and R&DB are correct.
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