One of the percussion houses in West London hires out various alternatives - they have several sizes of proper blacksmith's anvil, but also lengths of railway track, scaffolding and brake drums.
The VSL library has brake drums, springs and rails - i seem to remember a discussion when the Pro Edition first came out about a concert Percussionist who refused to carry around an actual anvil, and brought with him the alternatives instead.
All variations are struck with a metal hammer, and produce a high-pitched ring. To get the *BIG* Don Davis hits that you hear in the Matrix, you need to combine the high with mid and low - for instance, a bass drum and field drum. I'm talking 'percussion hit' - not just anvils/rails, to get anything other than a weedy sound...
Occasionally, I use the G-Town anvils, although the site still seems to be down
www.gtownsounds.com
best
peter