yes, that track that comes into South Amboy Station area does connect to the Amboy Secondary going west, that is called the Church Running Track and meets up with the track that goes to the Coast Line going east, which is the Essay Running Track, up by the Substation near the Conrail/NJT border, which is called CQ.
However, trains would have to head west to South Amboy Station, and a new crew would either have to get on, or the engineer would have to change ends, and a new brake test would have to be given - not a big deal, but time consuming and a potential trouble point if the train wouldn't cut in or out or whatever. Of course, an off peak transfer wouldn't be a big deal, but then you are clogging up the now 2 track Coast Line through South Amboy - something like that would have worked well when it was still 3 tracks through the station.
Again, I think there is a big problem with the Amboy Secondary route in that the whole route would be a total zig zag, which would slow train speeds and increase running times. Trains would head Southwest on the NEC (RR west), then at Rahway, turn South on the Coast Line (RR west again) then South West on the Amboy Secondary, to turn in Jamesburg to South East and some places East on the Freehold Sec, and then to turn again South/South west in Farmingdale.
Realistically, how fast would train speeds be at Essay, going up the hill towards the Amboy Sec? 15mph? Then the Amboy Sec isn't gonna be 80mph running, I seriously doubt, 60mph at best. Then, how fast would it be through towns like Helmetta where the track is right there? My guess would be 40mph if your lucky, probably 30. Then Jamesburg, again, how fast would the turn be at the wye to head west down to Freehold? then the running through the middle of downtown? I know a routing via MJ would require going over that same trackage, and the speeds would be slow too, but you are saving the time elsewhere.
Build either the station at Monmouth Jct, or a new track ALONGSIDE the NEC up to a new station in South Brunswick or Jersey Ave area and have transfers there to Jersey Ave trains.
Again, in my opinion, of course....
On the RR, "believe nothing you hear and only half of what you see"
John, aka "JTGSHU" passed away on August 26, 2013. We honor his memory and his devotion to railroading at railroad.net.