Comment by skissane
2 years ago
Apparently, this is no longer the case, and the old emulated PDP-11 system was replaced with a new system in 2014–2016: https://news.ycombinator.com/item?id=29157259
The old system we are talking about here was Ericsson JZA 715, mostly written in Pascal with some parts in PDP-11 assembly, running under RSX-11M. Melbourne was the first site in the Southern Hemisphere for Ericsson's JZA series train control software, going live in 1982. JZA 715 first went live in Oslo in 1979. Earlier iterations of Ericsson's JZA software (JZA 410) went live in Stockholm in 1971 and Copenhagen in 1972.
There is also an even newer CBTC system going into use for the new metro tunnel.
I wonder how much of that code is the old code compiled for the new platform.
As part of the new system, I don't think very much at all, since the two technologies are fundamentally different; CBTC is trains talking directly to each other, and cab/wayside signalling is the tracks telling the trains what to do.
That being said, it's pretty common in retrofits for the older system to still be around as a fallback if the CBTC fails.
8 replies →