British Transport Police officers have released CCTV images after a burglary at Greenfield rail station.
The incident happened at 6.10am on Wednesday 31 July.
Two one tonne tracked dumpers were stolen. The machines are valued at more than £8,000 each.
Two men are reported to have arrived at the station in a Volkswagen Crafter van then used a ramp to load the dumpers into the vehicle.
Officers believe the men in the images may have information that could help their investigation.
Anyone who knows them is asked to contact BTP by texting 61016 and quoting reference 127 of 31/07/19.
The public are also asked to keep an eye out for the stolen machines and report them to the police