If you want to put the dots over the letters and you're using MS Word, go 'Insert' and 'Symbol' and it brings up a grid of symbols and accents and select the one you want.
Most nameboards had the dot over the letter (called a séimhiú), modern Irish uses the letter 'h' to create the same effect as typewriters couldn't manage the dots.
Nameboards also came in a few sizes, with smaller than usual ones for signal cabins or perhaps narrow gauge locations. Some like the Sallins one came with a frame around them, others were just screwed onto 2 timber laths and fixed to concrete uprights without a surrounding frame. In this case the enamelled white border would be visible, though CIE periodically painted over the enamel nameboards in black and picked out the letters again in white (bit of a pointless exercise) and might neglect to paint the border in again.
Small signs of the same style were often used for station facilities, either back-to-back in a frame hanging from the station canopy or fixed on the wall above the relevant door or fixed to the door itself.
Here is Askeaton, in the smaller size and (unusually) in modern Irish.
https://stationroadaskeatoncommunity.files.wordpress.com/2014/02/img_0123.jpg