Another urban myth!!
There was no village demolished to make way for Central Station.
Grahamston had been razed a long time before the 1870’s.
Here’s a map from 1783 showing Grahamston.
It appears as a small settlement to the west of the expanding city of Glasgow.
Buchanan Street is the only recognisable city centre street in the vicinity.
By the 1850’s, some 20 years before the development of Central Station, the situation is much different.
By this time Grahamston had long gone, been replaced by the city centre blocks bounded by Argyle Street, Hope Street, Gordon Street and Union Street.
You can even see the street under Central Station, Alston Street!
By the 1890’s the last part of the former site of Grahamston was ready for redevelopment for the expansion of Central Station.
I prepared this map for entirely different thread, showing the development of Glasgow Railway Termini.
It shows the buildings soon to be demolished for the station extension.
Looks like typical Victorian block to me with the street layout of the surviving buildings being much the same as they were in the 1850’s map.
The maps clearly show that the little village of Grahamston was not demolished to make way for Central Station, there was in fact a City Centre street on the site.
I wouldn’t rely on any of the information from the Grahamston Story publication to answer the original query