| Rank | Country | Railways |
| Paracel Islands | void |
133 | Paraguay | total: 36 km standard gauge: 36 km 1.435-m gauge (2006) |
74 | Peru | total: 1,989 km standard gauge: 1,726 km 1.435-m gauge narrow gauge: 263 km 0.914-m gauge (2006) |
91 | Philippines | total: 897 km narrow gauge: 897 km 1.067-m gauge (492 km are in operation) (2006) |
| Pitcairn Islands | void |
12 | Poland | total: 23,072 km broad gauge: 629 km 1.524-m gauge standard gauge: 22,443 km 1.435-m gauge (20,555 km operational; 11,910 km electrified) (2006) |
57 | Portugal | total: 2,786 km broad gauge: 2,603 km 1.668-m gauge (1,351 km electrified) narrow gauge: 183 km 1.000-m gauge (2006) |
129 | Puerto Rico | total: 96 km narrow gauge: 96 km 1.000-m gauge (2006) |
| Qatar | void |
21 | Romania | total: 11,385 km broad gauge: 60 km 1.524-m gauge standard gauge: 10,898 km 1.435-m gauge (3,888 km electrified) narrow gauge: 427 km 0.760-m gauge (2006) |
2 | Russia | total: 87,157 km broad gauge: 86,200 km 1.520-m gauge (40,300 km electrified) narrow gauge: 957 km 1.067-m gauge (on Sakhalin Island) note: an additional 30,000 km of non-common carrier lines serve industries (2006) |
| Rwanda | void |
| Saint Barthelemy | void |
| Saint Helena | void |
132 | Saint Kitts and Nevis | total: 50 km narrow gauge: 50 km 0.762-m gauge on Saint Kitts for tourists (2006) |
| Saint Lucia | void |
| Saint Martin | void |
| Saint Pierre and Miquelon | void |
| Saint Vincent and the Grenadines | void |
| Samoa | void |
| San Marino | void |
| Sao Tome and Principe | void |
82 | Saudi Arabia | total: 1,392 km standard gauge: 1,392 km 1.435-m gauge (with branch lines and sidings) (2006) |
90 | Senegal | total: 906 km narrow gauge: 906 km 1.000 meter gauge (2006) |
51 | Serbia | total: 3,379 km standard gauge: 3,379 km 1.435-m gauge (electrified 1,254 km) (2006) |
| Seychelles | void |
| Sierra Leone | void |
| Singapore | void |