BALTIMORE — Environmentalist groups plan to rally outside of Baltimore’s City Hall in support of a bill that would ban the construction of new crude oil terminals.

The Baltimore Sun reports the Wednesday rally is in support of the City Council taking up the bill as part of an effort to limit oil trains passing through Baltimore. The bill would change the zoning code to ban the construction and stop the city’s two existing terminals from expanding.

It’s unknown how much oil passes through Baltimore; Railroad company CSX says it has never sent dedicated oil trains through Baltimore, but state records show oil traveled through it.

City lawyers say that without clearly defining crude oil, the law would be impermissibly vague, but singling out one kind of oil may violate constitutional protections.

Information from: The Baltimore Sun,