- + names abbreviated whenever possible
- ° heavy rail
- # not managed by IP (and/or its predecessors)
- † closed (completely)
- ‡ planned
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- †† reopened
- †‡ reopening planned
- ‡† cancelled project
- ‡‡ planned using former project
- ↑ replaced using former trackbed
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- ² 7 ft 1⁄4 in (2,140 mm) Brunel gauge
- ᴮ 1,668 mm (5 ft 5+21⁄32 in) Iberian gauge
- ⁱ 1,435 mm (4 ft 8+1⁄2 in) Standard gauge
- ¹ 1,000 mm (3 ft 3+3⁄8 in) Metre gauge
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- ³ 3 ft (914 mm) 3-foot gauge
- ⁹ 900 mm (2 ft 11+7⁄16 in) 900 mm gauge
- ⁶ 600 mm (1 ft 11+5⁄8 in) 2-foot/600 mm gauge
- ⁴⁺ Larmanjat monorail
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