| Number | Type | Builder | Year Purchased | Previous Owner/ Number | Disposition | Notes |
| 1:1 | 4-4-0 | Baldwin | 1888 | PRR | Retired 1907 | |
| 1:2 | 2-8-0 | Baldwin | 1907 | Scrapped 1929 | purchased new | |
| 1:3 | SW900 | EMD | 1954 | To Conrail 8658 | purchased new | |
| 2:1 | 4-4-0 | Baldwin | 1888 | NYC | Scrapped 1909 | |
| 2:2 | 2-8-0 | Baldwin | 1909 | Scrapped 1929 | purchased new | |
| 2:3 | SW900 | EMD | 1954 | To Conrail 8659 | purchased new | |
| 3:1 | 4-6-0 | Baldwin | 1890 | PRR 1021 | Retired 1892 | |
| 3:2 | 4-6-0 | Baldwin | 1892 | Scrapped 1915 | purchased new | |
| 3:3 | 0-6-0 | Baldwin | 1917 | General Equipment Co. | Sold to F.H. Wilson 1922 | |
| 3:4 | SW900 | EMD | 1954 | To Conrail 8660 | purchased new | |
| 4:1 | 4-6-0 | Baldwin | 1898 | Scrapped 1915 | purchased new | |
| 4:2 | 0-6-0 | Baldwin | 1917 | General Equipment Co. | Sold to F.H. Wilson 1922 | |
| 4:3 | SW900 | EMD | 1954 | To Conrail 8661 | purchased new | |
| 5:1 | 4-6-0 | Baldwin | 1900 | PRR 1017 | Scrapped 1909 | |
| 5:2 | 2-8-0 | Baldwin | 1910 | Scrapped 1948 | purchased new | |
| 5:3 | SW900 | EMD | 1954 | To Conrail 8662 | purchased new | |
| 6:1 | 2-8-0 | Baldwin | 1905 | Sold to F.H. Wilson 1923 | purchased new | |
| 6:2 | SW900 | EMD | 1954 | To Conrail 8663 | purchased new | |
| 7:1 | 2-8-0 | Baldwin | 1918 | Scrapped 1938 | purchased new | |
| 7:2 | 0-6-0 | Baldwin | 1940 | Unknown | Scrapped 1947 | |
| 8:1 | 4-4-0 | Cooke | 1914 | DL&W 929 | Scrapped 1919 | |
| 8:2 | 0-6-0 | Juniata | 1928 | P&LH 7542 | Scrapped 1948 | |
| 9 | 2-8-2 | Baldwin "Mikado" | 1915 | Retired 1948, Scrapped | purchased new | |
| 10 | 2-8-2 | Baldwin "Mikado" | 1915 | Retired 1948, Scrapped | purchased new, Note A | |
| 11 | 2-8-2 | Baldwin "Mikado" | 1916 | Retired 1947, Scrapped | purchased new | |
| 12 | 2-8-2 | Baldwin "Mikado" | 1916 | Scrapped 1937 | purchased new | |
| 13 | Note B | |||||
| 14 | 2-8-2 | Baldwin "Mikado" | 1916 | Retired 1948, Scrapped | purchased new, Note A | |
| 15 | 4-6-2 | Baldwin | 1916 | Scrapped 1948 | purchased new | |
| 16 | 0-6-0 | Lima | 1947 | Scrapped 1954 | purchased new | |
| 17 | 0-6-0 | Lima | 1947 | Scrapped 1954 | purchased new | |
| 18 | 0-6-0 | Lima | 1947 | Scrapped 1954 | purchased new | |
| 19 | 0-6-0 | Lima | 1948 | Scrapped 1954 | purchased new | |
| 20 | 0-6-0 | Lima | 1948 | Scrapped 1954 | purchased new | |
| 21 | 0-6-0 | Alco | 1946 | Scrapped 1954 | purchased new | |
| 22 | 0-6-0 | Alco | 1948 | Scrapped 1954 | purchased new | |
Notes
Note A: Number 10 was retired before 14. At the time that number 10 was retired, number 14 was renumbered 10 to eliminate the gap at 13 (see Note B).
Note B: The RRRR never numbered any locomotive 13. This resulted in a gap in the Mikado Section of the roster.
(c)-2002 Gerald Oliveto
Raritan River Railroad History