On the grounds of Poroto Mintar, you can find a historic steam locomotive known as “SL Poroto.” Steam locomotives disappeared from across Japan around 1975, making this preserved train a rare and meaningful cultural asset.
When visiting Shiraoi, don’t miss the chance to see this impressive piece of railway history and take photos with SL Poroto!
1. Where did the name “SL Poroto” come from?
In 1975, local residents began a movement to preserve a steam locomotive as a cultural and educational symbol of Shiraoi.
On August 13, 1975, Shiraoi Town initiated negotiations with the former Japanese National Railways (JNR).
By August 15, an official application was submitted.
On March 4, 1976, approval was granted to lend the locomotive to Shiraoi.
The town allocated approximately 6.5 million yen for transportation and site preparation of the locomotive D51-333.On September 3, 1976, the locomotive departed Naebo Station (Sapporo) and arrived at Shiraoi Station the same day at 13:30.
On September 4, it was transported by trailer and installed on the shore of Lake Poroto.
A public unveiling ceremony was held on September 13.
The nickname “SL Poroto” was chosen through a public contest among local residents (named by Noriko Suzuki and Megumi Sawaguchi).
(Source: Shiraoi Town History)
2. Why was it moved to Poroto Mintar?
As part of the “Ioru Regeneration Project,” the locomotive—originally displayed for 31 years on the shore of Lake Poroto—was relocated to its current site near JR Shiraoi Station.
Today, visitors can easily view SL Poroto:
At Poroto Mintar
From JR Shiraoi Station
Even from the train window when passing through the station
3. About Steam Locomotive D51-333
Manufactured: December 17, 1974
Builder: Nippon Vehicle Manufacturing Co., Ltd.
Dimensions: Length 19.73 m / Height 3.98 m / Width 3.00 m
Weight: 125.77 tons
Driving wheel diameter: 1.40 m
Water capacity: 20 tons
Coal capacity: 8 tons
Main routes operated:
Muroran Main Line, Hakodate Main Line, Esashi Line, Matsumae Line, Yubari Line, Manji Line, and Horonai Line
Retired from service: November 5, 1985
Total distance traveled: 26,494,437 km
