P
- Pallas (Greek mythology: Pallas)
- GWR Standard Goods 0-6-0 (1856 - 1879)
- Pandora (Greek mythology: Pandora)
- GWR Standard Goods 0-6-0 (1863 - 1880)
- Panthea
- GWR Standard Goods 0-6-0 (1856 - 1878)
- Panther (Powerful animal: Panther)
- GWR Fire Fly class 2-2-2 (1840 - 1869)
- Pasha (Leader of people: Pasha)
- GWR Iron Duke class 4-2-2 (1847 - 1876)
- Peacock (Famous engineer: Richard Peacock)
- GWR Hawthorn class 2-4-0 (1866 - 1875)
- Pearl
- GWR Standard Goods 0-6-0 (1852 - 1878)
- Pegasus (Greek mythology: Pegasus)
- GWR Fire Fly class 2-2-2 (1842 - 1868)
- Pelops (Greek mythology: Pelops)
- GWR Standard Goods 0-6-0 (1855 - 1876)
- Penn
- GWR Hawthorn class 2-4-0 (1866 - 1877)
- GWR Hawthorn class 2-4-0T (1877 - 1892)
- Penwith (Geography: Penwith)
- WCR 2-4-0ST (1872 - 1888)
- Peri
- GWR Prince class 2-2-2 (1846 - 1870)
- Perseus (Greek mythology: Perseus)
- GWR Iron Duke class 4-2-2 (1850 - 1880)
- Phlegethon (Greek mythology: Phlegethon)
- GWR Fire Fly class 2-2-2 (1842 - 1866)
- GWR Hawthorn class 2-4-0 (1866 - 1887)
- Phoenix (Greek mythology: Phoenix)
- GWR Fire Fly class 2-2-2 (1842 - 1870)
- NCJR (c.1869 - 1874)
- Pices (Zodiac: Pisces)
- GWR Leo class 2-4-0 (1842 - 1874)
- Pilot
- BGR 2-4-0 (1844 - 1851)
- Pioneer
- GWR Standard Goods 0-6-0 (1861 - 1877)
- Pirate (Literary: The Pirate)
- GWR Waverley class 4-4-0 (1855 - 1876)
- Planet
- GWR Mather, Dixon 2-2-2 (1839 - 1840)
- Plato (Greek personality: Plato)
- GWR Banking class 0-6-0ST (1854 - 1883)
- Plutarch (Greek personality: Plutarch)
- GWR Standard Goods 0-6-0 (1862 - 1875)
- Pluto (Roman mythology: Pluto)
- GWR Fire Fly class 2-2-2 (1841 - 1870)
- SDR Gorgon class 4-4-0ST (1866 - 1892)
- Plutus (Greek mythology: Plutus)
- GWR Standard Goods 0-6-0 (1855 - 1874)
- Plym (Georaphy: River Plym)
- GWR Standard Goods 0-6-0 (1859 - 1875)
- Polar Star
- GWR Star class 2-2-2 (1840 - 1870)
- Pollux (Greek mythology: Castor and Pollux)
- GWR Fire Fly class 2-2-2 (1842 - 1866)
- SDR Eagle class 4-4-0ST (1865 - 1892)
- GWR Hawthorn class 2-4-0 (1866 - 1877)
- GWR Hawthorn class 2-4-0T (1877 - 1892)
- Premier
- GWR Mather, Dixon 2-2-2 (1837 - 1840)
- GWR Premier class 0-6-0 (1846 - 1869)
- Priam (Classical ruler: Priam)
- GWR Fire Fly class 2-2-2 (1842 - 1864)
- SDR Comet class 4-4-0ST (1851 - 1876)
- Prince
- GWR Prince class 2-2-2 (1846 - 1870)
- SDR 2-4-0ST (1871 - 1892)
- 'Princess
- SWMR 0-6-0ST (1863 - 1872)
- Prometheus (Greek mythology: Prometheus)
- GWR Iron Duke class 4-2-2 (1850 - 1887)
- GWR Rover class 4-2-2 (1888 - 1892)
- Proserpine (Greek mythology: Proserpine)
- GWR Fire Fly class 2-2-2 (1842 - 1873)
- Psyche (Greek mythology: Cupid and Psyche)
- GWR Standard Goods 0-6-0 (1853 - 1874)
- Pyracmon
- GWR Pyracmon class 0-6-0 (1847 - 1872)
- Python (Greek mythology: Python)
- SDR Buffalo class 0-6-0ST (1874 - 1892)
Read more about this topic: List Of Broad Gauge (7 Feet) Railway Locomotive Names