QUOTE: Originally posted by kenneo QUOTE: Originally posted by mudchicken KENNEO: Rockwells GPS "LARS" system will work to keep trains positively separated end-to-end, but is useless in a siding. Until there are HARM stations all over the place so that the system has survey grade accuracy, the system can't tell the difference between fouling and safely passing in a siding 15 feet parallel to the other track. I addition trees, bridges and tunnels render the system useless. GE tracks locomotives to +/- 500 feet for maintenance purposes, but not for collision avoidance telemetry. Factor into this that most people do not understand GPS and do not know the difference between GPS and GIS. Maybe we'd be better off making Missouri, Seattle and the clones wear a GPS collar and instead of Amber Alerts, post Quack Proxcimity Alerts (!) that would force them underground where they belong... MC Just read your post here. A little slow getting around to things, I guess. YES, a QPA system would certainly be a plus!!!!!! (That is good - I like it. Where is Mookie when you need her!) I haven't been active in 4'8.5" to the foot railroading since the SP dumbsized a bunch of us BRAC/TCU folks just after the UP flooded the market with the dumbsizing all of their agreement clerks and agents. That's 10 years, now. So, what I had in mind was a GPS version of Automatic Train Stop. Which is a different sort than the type they have been using at Carrolls (physical contact activation). Where the collisions have occurred is a control point consisting of two crossovers between a double track main. Simply put, if the light is red, the train stops. Accuracy within 500 feet should be adequit for this. I realizethat I am oversimplyfying this, but my knowledge is not what I would like on this subject. The irony of it is that after the 1995 Carrolls headon that killed all 5 crew members, this M type got the FRA, WaDOT, the BN and UP to fund and operate trials and development of a GPS "operated" ATS system over this very section of the Portland-Seattle main line. Never heard about it again. In 1995, a NB UP was going to crossover and a SB BN was to wait for the UP and then operate straight rail. UP had not gotten to the signal, and the BN ran a double red, straightened the switch and then head-on into the UP. Peasoup Fog. Closing speed was pushing 100 MPH In 2003, the BN (SB) was 2/3 through the X when the NB UP ran the signal and into their side. Rain. Both times, cars and containers came through the trees between the tracks and I-5 and blocked I-5. In '95, both directions. The railroad is double track, signaled both ways, from the Steel Bridge (Portland)(bridge is at south end of Union Station) to Interbay Yard (ex GN yard in Seattle north of King Street Station (Amtrak) about 2 or 3 miles. Except at King Street and King Street Coach Yard, all mainline switches are CTC even within yard limits - ABS, of course, between the control points. Stay warm. Stay dry.
QUOTE: Originally posted by mudchicken KENNEO: Rockwells GPS "LARS" system will work to keep trains positively separated end-to-end, but is useless in a siding. Until there are HARM stations all over the place so that the system has survey grade accuracy, the system can't tell the difference between fouling and safely passing in a siding 15 feet parallel to the other track. I addition trees, bridges and tunnels render the system useless. GE tracks locomotives to +/- 500 feet for maintenance purposes, but not for collision avoidance telemetry. Factor into this that most people do not understand GPS and do not know the difference between GPS and GIS. Maybe we'd be better off making Missouri, Seattle and the clones wear a GPS collar and instead of Amber Alerts, post Quack Proxcimity Alerts (!) that would force them underground where they belong... MC
Have fun with your trains
Deshler Ohio-crossroads of the B&O Matt eats your fries.YUM! Clinton st viaduct undefeated against too tall trucks!!!(voted to be called the "Clinton St. can opener").
Our community is FREE to join. To participate you must either login or register for an account.