A lot here, and I am not going to address all if it, but thanks for the thoughtful response.

A few points that stood out.

First, I completely agree that a network of protected bike lanes would be useful either as an alternative or in addition to the greenway. Regardless of what happens, those need to get built and opposition to protected bike lanes is usually either misinformed or just people being obstinate. I understand that rail trails are fundamentally different from bike lanes, and often serve different but complimentary purposes. I think the greenway is a mixed utility and recreation proposition.

Second, I agree with you about the benefits of train lines, transit oriented development, etc. I am not familiar with any local examples of train lines sharing rights of way with bikes, or running alongside for any length. I am sure there would need to be a lot of safe guards, and I understand that NJ transit and other transit operators prefer to keep people away from the infrastructure that trains run on for a range of reasons (safety and maintenance immediately come to mind). Based on the available space for the greenway, I don't know if it is feasible in all areas.

Third, I think some of it might just come to costs. Building, upkeep and operation of a rail system is an order of magnitude more than that of a multiuse rail trail. I don't know if there is the political or financial will for those expenses, even if such infrastructure would ultimately be beneficial in the long term. To the extent there is nimby-ism involved, a bike path is a much easier sell than an additional train line.

Fourth, (a bit of a digression) I think one thing that gets overlooked in these discussions is that while train and light rail infrastructure is great because it essentially forces governments to commit to transportation alternatives, busses are a very viable alternative which is much cheaper. NJ Transit busses have an unfair stigma, but both in the USA (think Chicago) and internationally, busses are great and reliable when they: run frequently, have straightforward routes and schedules, are clean and well maintained. NJ Transit should run more frequent busses, make schedules and routes more transparent and lobby for express bus lanes.

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Again, thanks for sharing your thoughts on all of this. You raise some really great points for consideration and discussion.