- + names abbreviated whenever possible
- ° heavy rail
- # not managed byIP (and/or its predecessors)
- † closed (completely)
- ‡ planned
| - †† reopened
- †‡ reopening planned
- ‡† cancelled project
- ‡‡ planned using former project
- ↑ replaced using former trackbed
| - ²7 ft 1⁄4 in (2,140 mm)Brunel gauge
- ᴮ1,668 mm (5 ft 5+21⁄32 in)Iberian gauge
- ⁱ1,435 mm (4 ft 8+1⁄2 in)Standard gauge
- ¹1,000 mm (3 ft 3+3⁄8 in)Metre gauge
| - ³3 ft (914 mm)3-foot gauge
- ⁹900 mm (2 ft 11+7⁄16 in)900 mm gauge
- ⁶600 mm (1 ft 11+5⁄8 in)2-foot/600 mm gauge
- ⁴⁺Larmanjatmonorail
|