smallspy
Senior Member
While there are a lot of historical factors as to why it was or wasn't the case, today the reasoning is because freight trains there aren't 10,000+ feet long and weigh 20,000 tonnes, and require multiple miles to come to a stop. They do here, and with regularity.Not sure why regulations in North America are so different than in Europe, but in Europe subway cars can and do intermingle with (freight) rail, but trams most definitely don't (some tram-trains can operate on a section of mainline track, but I've never seen / heard of a tram coupled in a freight consist, quite unlike subway cars), so at least in Europe it makes sense to call subways heavy rail and trams light rail in absolute terms, even though subway cars there aren't necessarily built more heavily than here.
And because the size, weight and speed of the freight trains in Europe are much closer in scale to their passenger equipment, it is much easier to mix them all together.
Another reason is that there is a far, far larger spread of wayside oversight systems in place to protect trains against each other in Europe than there is in North America. PTC is a very, very recent innovation here, and while yes there were some systems in place since the 1930s, they were far more limited in scope and installation. In Europe, there are entire regions that have had systems in place since the 1960s.
Dan




