reaperexpress
Senior Member
ETCS is not a "system" per se. Nor is it a particular technology. It's more like a set of standards. I'd say it's a signal system architecture, but even that's not really true, since the different ETCS Levels have significantly different architecture. ETCS can be anything from a rudimentary block system on a rural branch line with axle counters, to a fully communications-based system with moving blocks, comparable to CBTC.Can I point out one thing about ETCS.....
It was the best system 10 years ago. It may not be the best system tomorrow.
Let's not focus on one sole technology for technology's sake. They reason why they are going to test on the Richmond Hill Line is because it is isolated, and will help guide the installation on future corridors - but it may also show that it can not work in the North American environment. Metroilnx may have settled on ETCS for now, but that is certainly not the only option that they have looked at, , going all the way to full-blown CBTC setups as well.
Dan
As far as I'm aware, communications-based moving-block signalling systems are the pinnacle of current signal technology, so it's not reasonable to imply that ETCS is obsolete. I'm not even sure it's possible for ETCS to become obsolete, because it's constantly being developed. One exciting recent development is virtual micro-blocks, which provide the performance of a moving block system while making it much more practical to overlay physical blocks for non-equipped freight trains. The Netherlands developed that capability within the past decade and it was incorporated in to ETCS Level 2 Baseline 3 in 2023. Whenever there's a new innovation in signal technology, it can either be incorporated into existing ETCS architectures by swapping out the relevant components (thanks to the standardized communications protocols between components) or if necessary they can create a new ETCS Level to incorporate that technology.
When Metrolinx says "We are implementing ETCS", it means they are signing on to the world's most common set of standards for railway signalling communications, rather than locking themselves in to a proprietary system like the TTC did with CBTC on the Finch West LRT (Thales) and Eglinton LRT (Bombardier/Alstom). It's impossible to run a Finch LRT train on the Eglinton LRT due to incompatible CBTC systems, even though the lines would otherwise be compatible with each other (same loading gauge, platform height, electrification etc). New York has done some good work to enable intercompatibility between CBTC systems, but their work is not easily applicable to mainline railway applications (especially with non-equipped freight trains sharing the line).
PTC is another option sometimes suggested for Metrolinx, but it's little more than a set of performance requirements for Automatic Train Protection in the US, while ETCS is a full set of signal standards used around the world. PTC generally tacks onto traditional North American signal systems, which are much more expensive to implement with the super-tight blocks we need for GO Expansion service levels. The traditional North American systems also create unnecssarily high task saturation for train operators when there are very short blocks.
We're not implementing ETCS Level 2 because it's cool to have new technology, we're implementing it because ETCS L2 is specifically very well suited for situations like GO Expansion: high-frequency passenger train operation on a line shared with freight trains, with differing levels of signalling equipment aboard a variety of different train types from different operators. Metrolinx has stated that they plan to adopt the ETCS standard, and I don't see any reason to doubt that, nor suggest that they should do otherwise.
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