crs1026
Superstar
Because people are stupid (or one might say that it's due to tradition, but both are often one and the same).
That’s a bit disrespectful, and quite far from the truth. There is a lot of conscious weighing of alternatives.
If you have a (mostly) standalone system that operates (largely) behind a firewall, that has decades worth of technical data and specifications and practices that would have to be revised, it’s costly to make changes - and for very little benefit. There would be a huge room for error during the transition. The consequences of those errors would be lethal and possibly horrific. Not going to metric might seem odd, but there aren’t many decimal calculations needed - 39 feet to a length of rail, 130 pounds to a yard, and 60 mph is one mile a minute are about as precise as anyone needs to get.
There’s no question that had North American railways gone to metric, they would have eventually gone over the learning hump. At some point, clinging to Imperial will be disfunctional. In actual fact, metric is slowly seeping into railway industry - they order (and measure) fuel in litres, clearance specs are now drawn and expressed in centimeters, and customer shipments are frequently in metric. Much of the material they procure is bought in metric because that’s how the world is selling stuff. So it’s happening, but gradually in a controlled and measured and affordable manner. Interoperability with the USA is a huge consideration, it would be very costly to spit into the wind on US practices.
The sacred ground is the system of speed and distance accounting, and the physical nomenclature of track and signals. That’s safety critical, and really no more regressive than aviation sticking to knots and feet of elevation. (Imagine the impact on aviation if every runway and course heading had to be renumbered to get away from an Imperial system where there are 360 degrees in a compass circle) Hey, we still have Sixteen Mile Creek. The Who can still see for miles and miles. It works, and any down side is pretty small. Nothing to get bothered about.
- Paul
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