Signed in as:
By Walter Elliott
NEWARK - Those reading the Positive Train Control section of the New Jersey State Auditor's Jan. 29 report on NJTransit may have reminded them of the late Yogi Berra's "It's deja-vu all over again" line.
The late Montclair resident and Major League Baseball hall of famer, to be clear, was never known to be a commuter railroad fan. That particular reactionary quote, however, would be appropriate since NJTransit had asked for two prior PTC completion extensions since 2015.
New Jersey Transit Corporation Rail Operations, among several other Class One commuter railroads, last sought for extending the PTC completion deadline Dec. 14, 2018 from the Federal Railroad Administration of USDOT. Those railroads had to show the Washington, D.C. agency that they had completed at least 85 percent of the PTC work in six categories to get that extension.
PTC, as mandated by Congress' Rail Safety Improvement Act of 2008, involves linking train operators with their signal dispatchers through GPS satellites. The system of in-locomotive cab GPS transceivers and right of way antennas would automatically apply the train sets brakes in emergencies when the train engineer fails to do so.
Congress first extended the Dec. 31, 2015 deadline to Dec. 31, 2018 to help NJTransit, MTA Metro North and other similar railroads finish their jobs.
Failure to have PTC installed and staff trained would take the delinquent carrier off the railroad tracks. In NJTransit's case, Amtrak would have barred the statewide public carrier from using the Northeast Corridor, the Hudson River tunnels and New York Penn Station, among other federal assets.
Stopping NJTransit on Amtrak's property, since State Auditor Stephen M. Eells' 19-page report, has now loomed again on its horizon.
NJTransit was using a new installation and training schedule that the FRA approved Feb. 22, 2019. The carrier, up to then, had trained 900 of its Rail Operations staff, installed GPS transceivers on 282 train cabs and was testing part of the PTC along a 17-mile Morris County stretch of the Morris & Essex Line.
Eells, in his report, found that NJTRO had fallen behind schedule by Sept. 30, 2019. While 413 of its 440 train cabs, "the system is not yet functional due to software issues." The auditor further found that contractors had made six change order requests over the summer and that a PTC field test "involving ticketed passengers," set for July 2019, has not happened.
NJTransit, added the auditor, has not collected $9.1 million in damages from the said contractors.
Photo Credit - Event Horizon Telescope collaboration et al
NASA - A black hole and its shadow have been captured in an image for the first time, a historic feat by an international network of radio telescopes called the Event Horizon Telescope (EHT). EHT is an international collaboration whose support in the U.S. includes the National Science Foundation.
A black hole is an extremely dense object from which no light can escape. Anything that comes within a black hole’s “event horizon,” its point of no return, will be consumed, never to re-emerge, because of the black hole’s unimaginably strong gravity. By its very nature, a black hole cannot be seen, but the hot disk of material that encircles it shines bright. Against a bright backdrop, such as this disk, a black hole appears to cast a shadow.
The stunning new image shows the shadow of the supermassive black hole in the center of Messier 87 (M87), an elliptical galaxy some 55 million light-years from Earth. This black hole is 6.5 billion times the mass of the Sun. Catching its shadow involved eight ground-based radio telescopes around the globe, operating together as if they were one telescope the size of our entire planet.
“This is an amazing accomplishment by the EHT team,” said Paul Hertz, director of the astrophysics division at NASA Headquarters in Washington. “Years ago, we thought we would have to build a very large space telescope to image a black hole. By getting radio telescopes around the world to work in concert like one instrument, the EHT team achieved this, decades ahead of time.”
To complement the EHT findings, several NASA spacecraft were part of a large effort, coordinated by the EHT’s Multiwavelength Working Group, to observe the black hole using different wavelengths of light. As part of this effort, NASA’s Chandra X-ray Observatory, Nuclear Spectroscopic Telescope Array (NuSTAR) and Neil Gehrels Swift Observatory space telescope missions, all attuned to different varieties of X-ray light, turned their gaze to the M87 black hole around the same time as the Event Horizon Telescope in April 2017. If EHT observed changes in the structure of the black hole’s environment, data from these missions and other telescopes could be used to help figure out what was going on.
While NASA observations did not directly trace out the historic image, astronomers used data from NASA’s Chandra and NuSTAR satellites to measure the X-ray brightness of M87’s jet. Scientists used this information to compare their models of the jet and disk around the black hole with the EHT observations. Other insights may come as researchers continue to pore over these data.
There are many remaining questions about black holes that the coordinated NASA observations may help answer. Mysteries linger about why particles get such a huge energy boost around black holes, forming dramatic jets that surge away from the poles of black holes at nearly the speed of light. When material falls into the black hole, where does the energy go?
“X-rays help us connect what’s happening to the particles near the event horizon with what we can measure with our telescopes,” said Joey Neilsen, an astronomer at Villanova University in Pennsylvania, who led the Chandra and NuSTAR analysis on behalf of the EHT’s Multiwavelength Working Group.
NASA space telescopes have previously studied a jet extending more than 1,000 light-years away from the center of M87. The jet is made of particles traveling near the speed of light, shooting out at high energies from close to the event horizon. The EHT was designed in part to study the origin of this jet and others like it. A blob of matter in the jet called HST-1, discovered by Hubble astronomers in 1999, has undergone a mysterious cycle of brightening and dimming.
Chandra, NuSTAR and Swift, as well as NASA’s Neutron star Interior Composition Explorer (NICER) experiment on the International Space Station, also looked at the black hole at the center of our own Milky Way galaxy, called Sagittarius A*, in coordination with EHT.
Getting so many different telescopes on the ground and in space to all look toward the same celestial object is a huge undertaking in and of itself, scientists emphasize.
“Scheduling all of these coordinated observations was a really hard problem for both the EHT and the Chandra and NuSTAR mission planners,” Neilsen said. “They did really incredible work to get us the data that we have, and we’re exceedingly grateful.”
Neilsen and colleagues who were part of the coordinated observations will be working on dissecting the entire spectrum of light coming from the M87 black hole, all the way from low-energy radio waves to high-energy gamma rays. With so much data from EHT and other telescopes, scientists may have years of discoveries ahead.
Ready to take your business or organization to the next level?