I put the 1901 and 1911 census links in a post earlier.
I had to out to vote.
I searched Coulter and stationmaster there was only one in Ireland.
I just searched stationmasters and got 43 in Ireland.
Then Donegal and got 3.
John Coulter
Benjamin Bogle
James Maher.
Checking on Inver, nearest place to Milltown, there is a James Patton in house number 1, the railway station.
Next to a Private dwelling, 2 Mills and a shop and drapery factory.
Skirl, what name are you looking for?
Maggsie