The calculated distance (air line) between Trá Mhór and Droichead Nua is approximately 72 miles respectively 116 kilometers.
By car or train, the actual journey to Droichead Nua is certainly longer, as only the direct route (as the crow flies) between Trá Mhór and Droichead Nua has been calculated here.
Air line (approximately)
116 kilometers
63 nautical miles