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with todays technology it should be easy to measure the speed at which a train is traveling on sections of track, and send a signal to slow it down or stop it...

But I worked for a company that sold computer systems for railways- A change in the technology today may not make it out into the field for 20 years, because of the mountain of government paperwork

They were still using 386 chips in the year 2005

98 posted on 09/29/2016 12:26:37 PM PDT by Mr. K (<a href="https://imgflip.com/i/1adpjl"><img src="https://i.imgflip.com/1adpjl.jpg" title="made at im)

But I worked for a company that sold computer systems for railways- A change in the technology today may not make it out into the field for 20 years, because of the mountain of government paperwork They were still using 386 chips in the year 2005

We used 68Ks. Keep in mind that these are safety critical systems, so they are held to a higher standard of reliability, which includes number of processors in use and time in service, and sometimes formal verification of the instruction set. The latest, greatest thing doesn't get used because there is no history of reliability. Can't be having a processor bug cause problems.