It appears to be a clearer definition of what is not allowed under the current rules, an adjustment in the wording rather than increase in the
From the article:
"We are looking at a prohibition that will allow the police to make sure individuals are not photographing sensitive areas of the system - but that would still allow tourists and train lovers and people who just find beauty in the system - to photograph it without infringing on their civil liberties," the source said.
They can ask what you are photographing but can not issue tickets unless you are photographing prohibitted areas.
Also from the article and the most convincing clarification as to what will be in the new rules:
Gene Russianoff of the Straphangers Campaign said his group could live with a new regulation that bans photography and filming of security-sensitive locations, such as underwater tunnels, dispatcher towers and equipment rooms.
You can add in places like crew quarters, yards, signals, and switches to the listing and leave more than enough to satisfy photographers.