First and foremost, from the many years that sand train rumors have flooded around this forum, I was under the impression that if sand trains were to happen for the Gateway Tunnels, the sand would be shipped by rail to the construction site, where it would be mixed into concrete/used for whatever directly at the site. If that's the case, how would trucks play in there?
In addition, if not for the Pine Barrens/Pinelands being protected land, there would still be sand trains on the Southern, and possibly down to Woodmansie would still be possible. With the Pine Barrens/Pinelands being protected, any new construction/expansion of sand pits in the area is forbidden, which is why a lot of sand pits went bust in the 80s/90s after decades of mining with no expansion. Every other forest except the Pine Barrens is being eaten up by developers right now.
As for an engine breaking a bridge, that just couldn't happen. If parking an engine on a bridge 'breaks' it, then that same engine going over said bridge with a loaded train would certainly make it collapse.
@baju First and foremost, the lumber traffic in Lakewood is not going to dry up, lol. As long as the Lakewood crowd has the ability to build stuff anywhere they want, there will be a huge demand for Woodhaven's services and products for years to come.
Second, the Freehold-Farmingdale reconnection is meant to take trains off of NJT. Not sure why NJT is so annoyed with a 1-2 times a week freight train, but that's just how it is. If Central Jersey is no longer industrial and has no hopes for industrial expansion, then NJT/the state of NJ would not have spent a lot of money making an alternative route for freight trains to follow, and would not be spending a lot of money on the new Raritan River Bridge to ensure that it can handle Plate F cars, both in terms of weight and height.
Lastly, NJT service is needed in this area. You can have all the electric cars in the world to drive people around here, but their manufacturing is horrific for the environment, the electrical grid is currently not able to handle all those electric cars and probably will never be able to as long as the state government here pushes "green" energy without nuclear energy in the equation, and it still won't solve the congestion issues.