SRT DA 540nkhr lapang Nakhon Lampang km.642+292 nkhr lapang Nakhon..

Builder Davenport USA

500 hp series
No. 511 - 540
Year in service 1952
Wheel arrangement Bo-Bo
Output 500 hp
Max speed 82 km/h

1000 hp series
No. 571 - 585
Year in service 1955
Wheel arrangement Co-Co
Output 500x2 hp
Max speed 92 km/h

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Thanks! Are the both 1000hp and 500hp model known as "Devenport" in Thailand? Or you have different names?

For Thai railfans, these models known as Davenport 500 or Davenport 1000, but easily called as Davenport.