Teams Gerard O'Brien played for
| Irish Senior Cup | Railway Union (2003-2012) |
| Leinster League | Railway Union (2005) |
| Railway Union Second XI (2010-2012) | |
| Leinster Cups | Railway Union (2001-2002) |
| Railway Union Second XI (2010) | |
| Leinster Twenty20 | Railway Union (2005) |
| Miscellaneous | Railway Union (2001-2008) |
| Railway Union Second XI (2011) |
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