That's been tried. It did no go well, and was hated by both crews and the public. Rode extremely rough because it turns out it's a very different optimization

That's been tried. It did no go well, and was hated by both crews and the public. Rode extremely rough because it turns out it's a very different optimization needed. https://en.wikipedia.org/wiki/Pacer_(British_Rail)#Analysis https://en.wikipedia.org/wiki/Pacer_(British_Rail)#Analysis