LOT Polish airlines
Stamp on the left:
Pm 36 is the name for a Polish experimental fast steam locomotive used by PKP (Polish State Railways). designed in 1936. One year later two of these locomotives were built, one of whom (Pm 36-2/ Beautiful Helena) survived the war and was operated until 1965.
Stamp on the right:
Passenger locomotive O149-7
(set of 4, 2002)Source mauritian philatelic blog