Full-Size Steam


Marshall Briannia 6NHP Portable Engine No. 50261 of 1908 SO678

Manufacturer Marshall, Sons & Co. Ltd
Model Britannia Portable Engine
Country of Origin UK
History Ex-Chile
Nominal Horse Power 6NHP
Works No. 50261
Year Built 1908
Condition Requires Boiler Work, Engine Complete
Asking Price £9,995

We are delighted to offer for sale, on behalf of the owner, Marshall 6NHP Britannia Portable Engine No. 50261. To be sold as a project requiring boiler work, this portable benefits from being in otherwise reasonably good condition with the motion able to run on piped in steam.

As with many portables entering preservation, there isn’t a huge amount of history to report on. We understand that Marshall No. 50261 was supplied new to Chile and is plated on the front with: ‘Unicos Agentes. Williamson Balfour & Ga. Valparaiso, Santiago. Concepcion Valdivia.’ For those not fluent in Spanish, that translates roughly to: ‘Sole Agents. Williamson Balfour & Ga. Valparaíso, Santiago. Concepción Valdivia.’ This plate, assuming originality, suggests it was supplied by an agent in Chile based in the centre of the South American country. As a portable power source, this 6NHP, single cylinder engine could’ve been tasked with any activity ranging from farming to small scale power production. It is a slide valve type with a single flywheel.

We understand it made its way back to Britain toward the end of the 20th/early 21st century at a time when it was fairly common for such engines to be transported from that part of the world. Having been in the same ownership for around 20 years, it is now on the market. Although still requiring restoration, efforts have been made to turn No. 50261 into a showable piece. It has been cleaned and oiled with originality maintained where possible. The motion work runs and is free moving. It truly gives the distinct feeling of an engine which has just finished working a long life – the day it finished!

In order to return to steam, we understand that it would need a complete overhaul of the boiler which is clearly pitted externally where the cladding was previously containing condensation. Despite this, it has been priced taking into account the completeness and the ‘as found’ character of the engine. The Britannia boiler is a distinguishing feature of this design of portable engine. Introduced by Marshall as a unique (at least to UK makers) firebox arrangement which allowed for the burning of lower quality materials in parts of the world where coal was in short supply. Not all Marshall Portables were fitted with the Britannia firebox but it was a common choice in some parts of the export market.

Overall, No. 50261 is an appealing engine which is full of character and which certainly has an interesting story to tell.

As with any steam engine or locomotive purchase, we would always encourage prospective buyers to employ the services of their own inspector to review the boiler prior to finalising any purchase.

Asking Price – £9,995

We always encourage prospective buyers to view vehicles and steam engines in person prior to purchase. This engine is advertised for sale by Berrybrook Steam & Classics on behalf of the owner and seller.

For the sake of viewing logistics, this engine is at our premises near Exeter, Devon for viewings. We ask that, where possible, all viewings are booked in advance by giving us a call on 01392 833301

Delivery can be arranged to anywhere in the UK, and beyond, at buyer’s expense.

The Company (Berrybrook Steam & Classics, trading name of Berrybrook Motors Ltd) offers the above details of this vehicle in good faith but cannot guarantee the accuracy of this information nor warrant the condition of the vehicle. A buyer should instruct their agents, surveyors or inspectors to investigate such details as the buyer desires validated. 

For Sale


Do you want to get involved in the world of steam? Are you considering buying a miniature steam engine? Are you stuck for a gift idea or are you simply looking for a good day out?

If so, we offer two different style days, tailored to suit your needs…

We offer a ‘Traction Engine Experience Day’, perfect as a gift and a fun day out learning a bit about what running a steam engine involves. We also offer a ‘Miniature Driving Lesson’ which is a half day course in the practical use of a scale traction engine.

Find out more


We specialise in the sale of steam engines and historic vehicles of all shapes and sizes! 

If you are looking to sell your steam engine or historic vehicle, we make both cash offers and sell on commission and would be more than happy to discuss the sale of your vehicle with you.

Find out more


Visit the official Berrybrook Steam & Classics online shop where we sell a range of steam-related products including gifts, parts and accessories for your miniature steam engine, gift vouchers for steam experience days and branded clothing!

Find out more

Milbury Model Company

We are delighted to announce the launch of our brand new partner website, the Milbury Model Company!

Our newest department is dedicated to supplying high-quality, brand new model and toy-sized steam engines, spares, accessories, gifts and more…

We are an official stockist for the complete range of Wilesco products which is sold from our Devon-based shop and is available to buy online.

Find out more

The Berrybrook Blog

Looking to find out more about the preservation movement, traction engines, historic vehicles or our heritage?

The Berrybrook Blog visits a range of topics to interest all readers!

See our Blog

We can help you sell…

We specialise in selling steam engines and historic vehicles of all shapes and sizes.

If you are looking to sell your steam engine or historic vehicle, we make both cash offers and sell on commission.

Find out more

Opening Hours















Our showrooms are open to anyone and you are more than welcome to pop in to say hello, regardless of whether a purchase is on your mind or not!

*We are occasionally open on some Saturdays by prior agreement only – please ring 01392 833301 on a normal working day to arrange a visit.

We are typically closed on Bank Holidays.

News & Events

Many of our local regulars know that we host annual ‘Boiler Test Days’ every Spring. It is attended ...

Read More

Contact Us

Contact Us
Fields marked with * are required.