The company says there have been 68 "bridge strikes" so far this year - compared to 85 in the entirety of 2015
Irish Rail has launched a new safety campaign on social media with the hashtag "Dumb Truckers".
It is highlighting a major increase in the number of high vehicles that crash while trying to drive under railway bridges.
Across the country there have been 68 "bridge strikes" so far this year - compared to 85 crashes in all of 2014.
Irish Rail says that such crashes cause delays and safety risks to passengers, adding that it is regarded as "the single most likely cause of a serious rail safety incident on the network".
Penalty points and large fines have not prevented repeated strikes on bridges, the company says.
Irish Rail has also released a video to illustrate the dangers of bridge strikes.
Irish Rail spokesperson Jane Cregan says the high number of bridge strikes calls the competency levels of truck drivers into question.
"It's a fairly basic thing to know the height of your vehicle before you transport it through a restricted bridge height area," she suggested.
She highlighted that last Thursday two bridges in the Grand Canal area in Dublin were struck by two different trucks within two hours of each other.