positive train control (PTC) after a fatal 1987 collision caused by a crew not obeying signaling. (PTC is a safety feature long-sought by federal safety officials for all railroads). FEC has what is called by some a "prime" railroad right-of-way. The heavy weight of the rock trains required very good trackage and bridges. The railroad has mostly 136 pound-per-yard (66 kg/m) continuous-welded rail attached to concrete ties, which sits on a high quality granite roadbed. The entire railroad is controlled by centralized traffic control with constant radio communication. Because the railroad has only minor grades, it takes very little horsepower to pull very long trains at speed. trains are a normal FEC operating standard. Passenger service The FEC was already in the freight-only business when Amtrak was created and assumed passenger operations of nearly all U.S. railroads' passenger services in 1971. Periodically, there has been speculation that the southern end of the FEC line might be used for a commuter rail service to complement the existing Tri-Rail line (which follows former CSX tracks to the west). There has also been some discussion about Amtrak or the State of Florida using FEC lines for a more direct route between Jacksonville and Miami. In March 2012 FEC Industries (not FEC Railway) proposed a privately owned and operated service between Miami and Orlando along its route, to be named All Aboard Florida. New high speed trackage would be built between Brevard County (the oceanside county east of Orlando) and Orlando International Airport. In addition to the new track, the main line is once again being expanded to double track from Brevard County to Miami (some of the bridges still have adequate width from the previous double track). In 2014 the very first beginnings of All Aboard Florida commenced with studies and actual construction of the first phase, and construction began in November 2014. In 2015, AAF announced they will operate the service under the name Brightline, since 2018 operated by Brightline, after a few delays, service on an initial stretch between West Palm Beach and Fort Lauderdale, and shortly after their Miami Terminus MiamiCentral started in January 2018, with new stations in Boca Raton and Aventura being launched in 2022, and a new railway extension to Orlando International Airport opening in 2023, and a future rail expansion to Tampa still in the planning stage, as of Fall 2022. Rock trains A lifeblood of