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Spain has quite a few narrow gauge lines, all are meter gauge. There used to be other narrow gauges, but they've all either been converted to metre or closed (mostly closed). The narrow gauge network in the north and northeast of Spain forms the bulk of narrow gauge lines, it is the largest narrow gauge network in Europe with about 1200km (for comparison, the rhaetian railways in switzerland have 384km).
Pic related shows the lines that are still operated by the state, while others have been transferred to the regional governments.
The service on these lines is quite slow. The lines were much more economical to build with sharper turns and fewer tunnels and viaducts, which, however, means slower trian speeds and less direct lines. But on the other hand that's still better than nothing, and the difficult terrain would have made it very expensive to build iberian-gauge lines. Though the lines aren't competitive at all for long journeys, they do ok on short to medium length trips. There's also pretty some commuter services around the major cities.
