Gardai and emergency services are attending the scene of an incident along the railway line outside Ballyhaunis.
Midwest News understands that a body has been found on lands near the line on the Castlerea side of the town.
Investigations into the incident are ongoing
Gardaí say the results of a post mortem examination will determine the course of their investigations.
Irish Rail passengers intending to travel on Westport/Dublin train services today will encounter delays as a result.
In a statement on social media Irish Rail have indicated that bus services will transport passengers west of Athlone.
The 13:40 Heuston to Westport service is operating as train from Heuston to Athlone and bus transfers from Athlone to Westport.
The 13:20 Westport to Heuston service is operating as bus transfers to Athlone and as a train from Athlone to Heuston.