A Bay platform is a terminal platform at a railway station that is located on a through railway line. Historically, such platforms existed at stations where a branch line starts/ends. There was a bay platform at Mallow, Co. Cork, called the “Waterford Bay” as it was used by trains travelling to/from Waterford. A similar platform existed at Portlaoise for trains to Kilkenny running via Abbeyleix.
Nowadays, bay platforms can be found at Ballybrophy for trains to Limerick, Manulla Junction for Ballina trains and Clonsilla for M3 Parkway trains.
A modern day equivalent is the ‘turnback siding’ where a bay platform is provided at a station to allow a commuter service to travel to that station and clear the running lines before ‘turning back’ to its original location. Turnback sidings exist on the Kildare Route at Adamstown and Hazelhatch & Celbridge.
An aqueduct is an engineered structure designed to carry a body of water over some other feature. Whilst primarily used in canals, rivers can be diverted into aqueducts where diversion of the river is not feasible.
The Grand Canal spans the River Barrow in Monasterevin, Co. Kildare by means of an aqueduct. Also on this line of canal, the Leinster Aqueduct near Sallins carries the canal over the River Liffey. This saved the canal from having to lock down into the river and lock back up on the other side of the Liffey to continue its journey.
The building of the railway network in Ireland resulted in a small number of streams being diverted into aqueducts over railway cuttings, such as at Hillsborough, Co. Down and at Mossley West station in Co. Antrim, where Archibald’s Aqueduct spans the railway line.
An adit is a feature of a mine, which most people would refer to incorrectly as a ‘mineshaft’. It is a horizontal or near horizontal entrance to a mine. Within the mine, horizontal passages are known as ‘levels’ and an adit is a category of level that opens into the outside world. Adits can be used for the passage of road vehicles and/or railway rolling stock.
The use of adits for the removal of ore/drainage is more effective than shafts as their (near) horizontal nature makes for easier transport than hoisting material up a shaft.
Adits can vary in size, dependant on what was being transported through them. ‘Old mens workings’ or mines created before the advent of mechanisation, tend to be very small as only humans/animals passed through whereas for mining using modern trucks, adits can be quite large.