I oiled the moving parts and was delighted with my test. Here is some info from Jensen.
Jensen's largest & most powerful Hobby Line Steam Engine, features a double acting stationary slide valve cylinder with plenty of low speed torque, 2-1/2 x 6 boiler, reversible, 2 speed pulley and a F-N-R Stephenson link shift lever. Includes 400 watt heater, pop valve, whistle and throttle. Bore: 1/2" x 5/8" Stroke. The item "Vintage Jensen 25 live steam engine, tested, working, no leaks, whistle, reverse" is in sale since Sunday, March 7, 2021.
This item is in the category "Toys & Hobbies\Vintage & Antique Toys\Other Vintage & Antique Toys". The seller is "willyrockwell" and is located in West Orange, New Jersey.
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