Moderators: GirlOnTheTrain, mtuandrew, Tadman
ApproachMedium wrote: ↑Wed Jul 06, 2022 1:12 pm The Siemens locos all run on Linux software. The original run away throttle problem they had (around the same time 188 crashed) was a problem in the programming that when reached said bug the OS would crash, revert the date to Linus Torvalds birthday and the throttle would get stuck in power until it reset itself a minute or two later. Similar issue would happen with the dynamic. The dynamic was a better situation because stopping is more favorable than going out of control.Having mucked with the Linux kernel a bit, I can see how Siemens built a custom "spin" of a Linux OS that behaves like a RTOS. The kernel can be compiled for it.
Ill take knife switching old diesels any day over playing system IT admin on these ACS. When certain problems happen i turn the battery contactor off and that upsets some people. But guess what? It gets it going again, and i dont want to live here i want to go home.
photobug56 wrote: ↑Thu Jul 07, 2022 8:06 pm While I've long been a fan of Boeing, their poor quality control and cheapness on the 737 Max computer systems cost dearly. They use badly out of date and under powered computers, which doesn't help. They cheaped out on sensors (like angle of attack) and on warnings of mismatch between such sensors, and had 2 crashes as a result. Sure, at least one if not both aircrews were, IMHO, grossly incompetent, but the problems should never have happened. And consequences for such screwups in commercial airliners can and have been very bad.All of this. The siemens stuff is outdated, cheap crap. You would think the Germans would be making better stuff. They arent. You want a good, advanced computer tech (way ahead of its time, at the time) locomotive the ALP46 and A class were both running the same "age" tech but the Bombardier offering had the brains of Mercedies behind its original build. The same people whos motto is, its Mercedies, or nothing! Those locomotives have had their mechanical issues, but they were caused by poor local maintaince. But their doors still close perfect, none of the window gaskets are blown out, none of the door latches stick, all the seats work perfect and are still comfortable. The computers do not have glitchy problems and surprise, their 27 pin MU plugs MU with literally diesel locomotives made 50 years ago. All of which i just described are problems we are having with ACS64s. The most annoying is the lack of functional doors/door gaskets.
Now on locos, sure, they could cause accidents. But they are more likely just to cause breakdowns.
ApproachMedium wrote: ↑Thu Jul 07, 2022 4:48 pm Huge part of it. The biggest problem they have right now is they use the standard 27 pin MU plugs which are normally all analog and use relays. On the siemens engines, its done with a digital IO station that measures voltages. Ive mentioned before, if you get water in the MU plug the computer shows trailing unit faults, if theres no trailing unit. You can lick your hand and touch the pins and set a fault too..Dumb question. Does this Siemens MU set up meam that a Siemens loco or motor cannot control a trailing regular 27 pin analog and relay loco / motor?? Does that have to do anything with the inaguration trip troubles of the ALCs leading the PP-42s on the Builder? Could it have been that there was an engineer standing by in a P-42 to provide traction power?