Standard Gauge Passenger Steam Engine Os24

A big steam engine designed to high traction yet be able to run on weak track.


The rather uncommon axle arrangement gave the engine some unique characteristics – aesthetic and functional. Notably, the designation lead to it being nicknamed “Osa” – the Polish word for wasp.

OS24 at Warsaw Train Museum
Subscribers to our Video Channel get a special discount coupon to use in our shop. Click image to watch this video.

The picture at the right shows a model of the Os24 at the Warsaw Train Museum.

O – Passenge Locomotive
s – axle Arrangement – 2-4-0
24 – Initial year of production.

The railroads in the Southern part of Poland were characterized by weak track. So engines had to have a low axle load.

The 2-4-0 axle arrangement offered a low axle load with high traction capability.

The wheel arrangement required that the boiler be mounted high so the firebox had sufficient clearance. This gave the engine a unique and attractive appearance.

Speeds were limited due to instability at around 80 km per hour.

There is one surviving specimen that you can see at the Warsaw Train Museum.

And you can read a lot more about the history of the Os24 at



We hope that you found the information in this page useful. The internet is all about getting and giving. And giving back is the best. Please donate $1 or more to aid us in our continuing quest to add to and polish the information in our site.

Scroll to top