摘要 :
The most widely accepted criterion for wheelclimb derailment defines an upper limit for safe operation on wheel/rail contact forces on the climbing wheel, with the limit varying with time duration of the forces. For dynamic wheelc...
展开
The most widely accepted criterion for wheelclimb derailment defines an upper limit for safe operation on wheel/rail contact forces on the climbing wheel, with the limit varying with time duration of the forces. For dynamic wheelclimb processes with significant lateral velocities, lateral forces may be measured for short time durations that are larger than those that may be sustained without derailment in steady state. To study wheelclimb derailment processes and evaluate derailment criteria, a series of derail¬ment experiments was conducted using a one-fifth scale model of a single wheelset on tangent track subjected to static and dynamic loading conditions. The results of these experiments were compared to simulations based on a nonlinear theory developed to represent the important phenomena associated with dynamic wheelclimb.
收起
摘要 :
The most widely accepted criterion for wheelclimb derailment defines an upper limit for safe operation on wheel/rail contact forces on the climbing wheel, with the limit varying with time duration of the forces. For dynamic wheelc...
展开
The most widely accepted criterion for wheelclimb derailment defines an upper limit for safe operation on wheel/rail contact forces on the climbing wheel, with the limit varying with time duration of the forces. For dynamic wheelclimb processes with significant lateral velocities, lateral forces may be measured for short time durations that are larger than those that may be sustained without derailment in steady state. To study wheelclimb derailment processes and evaluate derailment criteria, a series of derail¬ment experiments was conducted using a one-fifth scale model of a single wheelset on tangent track subjected to static and dynamic loading conditions. The results of these experiments were compared to simulations based on a nonlinear theory developed to represent the important phenomena associated with dynamic wheelclimb.
收起
摘要 :
During the time period between May 2013 and March 2014 the National Transportation Safety Board (NTSB) launched investigative teams to five significant accidents on the Metro-North Railroad (Metro-North): (1) the May 17, 2013, der...
展开
During the time period between May 2013 and March 2014 the National Transportation Safety Board (NTSB) launched investigative teams to five significant accidents on the Metro-North Railroad (Metro-North): (1) the May 17, 2013, derailment and subsequent collision in Bridgeport, Connecticut; (2) the May 28, 2013, employee fatality in West Haven, Connecticut; (3) the July 18, 2013, CSX derailment on Metro-North tracks in The Bronx, New York; (4) the December 1, 2013, derailment in The Bronx, New York; and (5) the March 10, 2014, employee fatality in Manhattan, New York. In combination, these accidents resulted in 6 fatalities, 126 injuries, and more than $28 million in damages. This special investigation report discusses all five of the recent Metro-North accidents investigated by the NTSB, examines some of the common elements of these accidents, and addresses the steps that Metro-North, the Metropolitan Transit Authority (MTA), and the Federal Railroad Administration have taken as a result of these investigations. This report also highlights lessons learned and provides recommendations to Metro-North, MTA, and several other entities to improve railroad safety on Metro-North and elsewhere.
收起
摘要 :
West Africa presents unique and complex challenges to the security of the United States (US) and critical US interests abroad. Nigeria, the largest and most diplomatically, militarily and economically progressive nation in West Af...
展开
West Africa presents unique and complex challenges to the security of the United States (US) and critical US interests abroad. Nigeria, the largest and most diplomatically, militarily and economically progressive nation in West Africa, faces severe threats of instability promulgated by the burgeoning terrorist group, Boko Haram. East Africa is the traditional focus of U.S. Africa Command (USAFRICOM); however, there is a compelling need to address West African issues before the region becomes the next primary challenge in the counterinsurgency (COIN) dilemma. Detailed USAFRICOM engagement can prevent derailment of progress experienced by Nigeria in the last twenty years, protect the critical energy infrastructure the U.S. relies upon for over 8% of its oil imports, and prevent mass terrorist attacks both in Africa and directly against the U.S. and its allies by Boko Haram and other linked terrorist organizations. This paper highlights the benefits of employing Engagement Teams (ETs) to mitigate vulnerabilities within Nigeria and provides recommendations for a scalable plan tailored to accomplish USAFRICOM strategic objectives within the turbulent nation of Nigeria.
收起
摘要 :
This publication contains briefs of selected railroad accidents occuring in U.S.railroad operations. The brief format presents the basic facts, conditions, circumstances, and probable cause in each instance.
摘要 :
About 6:10 a.m., central daylight time, on September 2, 1998, the 17th through19th cars and the first two platforms of the five-platform 20th car of westbound Burlington Northern and Santa Fe Railway Company intermodal freight tra...
展开
About 6:10 a.m., central daylight time, on September 2, 1998, the 17th through19th cars and the first two platforms of the five-platform 20th car of westbound Burlington Northern and Santa Fe Railway Company intermodal freight train S-CHILACI-31 derailed at Crisfield, Kansas. The derailment resulted in a pileup involving four articulated multiplatform cars carrying intermodal shipping containers. Some of the containers were breached, resulting in the release of hazardous materials and fires. About 200 people were evacuated, but no injuries resulted from either the derailment or the hazardous materials releases. Estimated damage was $1.3 million. The safety issues addressed in the report include the adequacy of intermodal container loading and securement standards for the preloading inspection of double-stack cars and the adequacy of railroad industry training and practices with respect to emphasizing the importance of removing foreign objects from the wells of double-stack cars before loading. As a result of its investigation of this accident, the National Transportation Safety Board makes recommendations to the Federal Railroad Administration, to the Class I railroads, and to the Association of American Railroads.
收起
摘要 :
The publication contains briefs of selected railroad accidents occurring in U.S.railroad operations. The brief format presents the basic facts, conditions, circumstances, and probable cause in each instance.
摘要 :
The Accident Management Orientation Guide identifies the guidelines needed for mitigating the hazards associated with a hazardous materials (HM) in-service railroad derailment and a HM yard accident. The guide addresses all phases...
展开
The Accident Management Orientation Guide identifies the guidelines needed for mitigating the hazards associated with a hazardous materials (HM) in-service railroad derailment and a HM yard accident. The guide addresses all phases of on-scene emergency response operations from initial notification of emergency response personnel through departure from the accident scene of the cleanup/disposal teams, and resumption of normal operations. Examples of programmed decision-scenarios for handling HM rail derailments and yard accidents are included.
收起
摘要 :
Changing At-Risk Behavior (CAB) is a safety process that is being conducted at Union Pacific's San Antonio Service Unit (SASU) with the aim of improving road and yard safety. CAB is an example of a proactive safety risk-reduction ...
展开
Changing At-Risk Behavior (CAB) is a safety process that is being conducted at Union Pacific's San Antonio Service Unit (SASU) with the aim of improving road and yard safety. CAB is an example of a proactive safety risk-reduction method, called Clear Signal for Action (CSA), by the Federal Railroad Administration (FRA) Human Factors Program within the Office of Research and Development. CSA combines behavior-based safety, continuous improvement, and safety leadership development. With sponsorship from FRA, Behavioral Science Technology, Inc., is instructing and advising on the implementation of CAB.
收起
摘要 :
On January 15, 2007, about 11:12 a.m. eastern standard time (EST), a CSX Transportation Inc. (CSX) Road Switcher Train C70315 was switching at Patio Yard in Winchester, Kentucky (KY) at milepost (MP) 0WI 208.0 and lost control of ...
展开
On January 15, 2007, about 11:12 a.m. eastern standard time (EST), a CSX Transportation Inc. (CSX) Road Switcher Train C70315 was switching at Patio Yard in Winchester, Kentucky (KY) at milepost (MP) 0WI 208.0 and lost control of four loaded railcars. The four railcars, one of which contained (Butyl Acetate), rolled uncontrolled southbound onto the EK Subdivision for a distance of about 22.8 miles. The four railcars reached a speed of 35 miles per hour (mph), as indicated by an equipment defect detector at MP 0WI 227.2, until impacting the locomotives of Train N25214. Train N25214 was traversing northbound toward Patio Yard on the EK Subdivision. The crew members of Train N25214 had separated the two locomotives from the rest of the freight cars, operated the locomotives a distance of 0.8 of a mile and stopped. They abandoned the locomotives three or four minutes before the runaway cars struck the equipment. The collision and resulting fire caused the total destruction of the leading tank car and the leading locomotive, which had been positioned and then abandoned by the crew of Train N25214. There was extensive damage to the second locomotive of Train N25214 and the three remaining covered hopper cars. Total equipment damage is estimated at more than $2,581,630 and $15,000 for track damage. The lead railcar derailed on impact, the loaded tank car of Butyl Acetate and the fuel tanks of the lead locomotive ruptured and ignited. This caused a significant inhalation hazard causing an evacuation for about 12 mile from the accident site. The collision affected a small industrial operation and about 20 homes, totaling 80 people. The only reported injury was a sprained ankle on the conductor of Train C70315 when he attempted to apply handbrakes on the rolling railcars at Patio Yard. The weather at the time of the accident was intermittent rain, 60F with good visibility. The cause of the accident was the failure of the conductor of Train C70315 to properly secure equipment left standing with a sufficient number of hand brakes.
收起
