Adams_Umass_Boston wrote:dbperry wrote:R36 Combine Coach wrote:About two years ago, a similar runaway incident occurred with a CTA 2600 series set on the Blue Line, this time with an empty consist that crashed into another parked set. The commonality in both cases is the single handle controller (possibility of deadman or interlock failure as state above).
Interesting that the new article this AM doesn't mention the above incident. R36, do you have more details or a reference?
I believe the one R36 is referencing was the Blue Line In Chicago. I am guessing that's why the Globe did not reference it.
Does
this help?
[quote="On October 01, 2013 In an article entitled "Half-mile journey of CTA 'ghost train' baffles investigators", Jon Hilkevitch of the Chicago Tribune staff"]
Half-mile journey of CTA 'ghost train' baffles investigators
Investigators face a daunting challenge to sort out the bizarre half-mile journey of an out-of-service, possibly driverless CTA "ghost train" that breached multiple safeguards before colliding with another Blue Line train Monday morning.
The accident that sent more than 30 people to hospitals was unlike any that veteran city rail workers say they have seen: A train maneuvers around the curves in the Forest Park rail yard, passes through at least two track switches — any one of which should have stopped the train — continues past the station platform, then climbs up and over a small hill near the Eisenhower Expressway before accelerating to about 20 mph and ramming the stopped train at the Harlem stop shortly before 8 a.m.
"The million-dollar question is, 'How did this happen?'" said Robert Kelly, president of the CTA rail workers union. "This is baffling everybody."
The head-on impact occurred with 40 people aboard the standing train. Most of those hurt reported only light injuries after the crash, during which the front ends of both head cars puckered to absorb the force of the crash and protect occupants, as they are designed to do. The seats in the impact area were still intact.
The unanswered questions are the subject of an investigation being led by the National Transportation Safety Board. As a precaution, the Federal Joint Terrorism Task Force is also involved in the investigation, a law enforcement official said.
The probe stems from the fact that numerous redundancies are designed to prevent any single break in the safety chain from leading to an accident.
If the train were properly parked in the yard, the friction brakes would be applied to prevent the rail cars from moving, regardless of whether electrical power was being delivered to the train, CTA officials and rail workers told the Tribune.
A universal key that opens the cab doors on all CTA trains would be needed to enter the cab compartment, and a separate key would be needed to turn on the master controller and release the brakes, according to CTA operators.
In addition, to prevent a runaway train, CTA rail cars are equipped with a "dead man control." The train operator must turn the handle of the master controller and keep his or her hand on the handle to release the brakes and deactivate the dead man switch. If the handle is released while the train is moving, the motor automatically shuts off and the brakes are applied, officials said.[/quote]
Read more of the story at
Chicago Tribune's web site
Seen behind the motorman on the inside wall of a PCC departing "Riverside" many years ago: "Pickpockets are on duty for your convenience."