At my personal blog, I have a clutch of British railway viaduct photos, many with trains that you can just about spot!
The usual commentary about such viaducts is all about how much better they were at doing viaducts then, not like it is now, blah blah. But engineers now do good stuff too, I think. Better, arguably. Just not for railways.
I mean, you might just as well say that they were very bad at making vehicles go up steeper gradients in those days. The only reason they had to build all these viaducts is because railways had to be so very flat. And that’s now changed, hasn’t it?