| Year | Event |
| 1904 | Railway Union Hockey club founded as part of Railway Union Steampacket & Athletic Association |
| 1904 | J. Peterson represents Ireland |
| 1913 | Win 1st Senior Trophy (Leinster Senior Cup) |
| 1923 | Win Leinster Senior League for first time |
| 1925 | Win first Irish Cup - Irish Junior Cup |
| 1929 | Win first Irish Senior Cup |
| 1930 | Retain Irish Senior |
| 1931 | Become first club ever to win trophy three times in a row ! |
| 1931 | Another hat trick with Irish Senior, Leinster League & Leinster Cup titles in one year ! |
| 1933 | Win Leinster Senior League for remarkable 11th time in a row ! |
| 1939 | Win Irish Senior Cup for 4th time |
| 1957 | Seconds win Irish Junior Cup |
| 1970 | Joey O'Meara makes Irish debut |
| 1972 | Ireland win Intercontinental Cup (Spain) with Joey O'Meara as captain |
| 1973 | Jackie Phelan makes Irish debut |
| 1975 | Des Byrne captains 2nd XI to another Irish Junior Cup success |
| 1977 | Joey O'Meara makes last of his 52 irish caps (still a club record today) |
| 1980 | Ireland v England International played at Park Avenue |
| 1990 | Synthetic Pitch laid on grounds |
| 1996 | 1sts narrowly beaten by Pembroke in Irish Senior semi (1-0) |
| 2001 | Relegated to Division 2 |
| 2002 | Indoor squad represent Railway in European C Division in Brussels |
| 2002 | First eleven promoted to Senior One at first time of asking |
| 2004 | New State of the Art Olympic Standard Water Base laid in Park Avenue |
| 2005 | Indoor squad represent Railway in European C Division for 2nd time |