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Made in the UK

D R Mercer

D. R. Mercer working models are produced by a small Birmingham based precision engineering company, all parts are hand made to ensure a high quality finished model. Built to a scale of 5/8th of an inch to the foot. The boiler is constructed from brass, fully silver soldered, hydraulically tested with a working pressure of 15psi and fired by a spirit lamp with two wicks as standard, a gas burner is available as one of many optional extras and upgrades.

D.R.Mercer produces a number of extras whists Minsteam also produce a number of unique extras and upgrades available exclusively through ourselves.

Engine specifications-

  • Double acting cylinder

  • cylinder bore- 3/8th

  • Stroke- 11mm

  • weight- 5lbs, 2.3kg​

  • Piston- 1 fabric ring

  • Valve- Slide type

  • Valve Gear- Stephensons

  • Lubrication- Displacement to Cylinder

  • Width- 5 1/8 inches, 13cm

  • Height- 8 inches, 20cm

  • Length- 11.5 inches, 29cm (showmans 14.5 inches, 36cm)​

These engines are not toys, but collectors & steam enthusiasts miniatures. No machining or special tools are required just careful assembly with small hand tools.

D R Mercer: Products

Appointed distributers of D R Mercer engines, Live steam engine models & kits which are manufactured in Birmingham UK. We also stock many extras & upgrades, some made by Mr Mercer & a number of unique items made by ourselves in the Minsteam workshop.

Hielscher live steam models & kits.

UGears Mechanical wooden model kits.

Full restoration service available for D.R.Mercer & other engines.

Second user, we buy & sell all types of models new & old.

Due to very high demand for these great little engines at the moment there may be a longer than usual lead time. Do feel free to get in touch for an up to date time scale, we will do our best to help with any requirement you have.

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D.R.Mercer Type 1

Available as a kit, painted kit or ready to run.

The Type one Mercer engine is fitted with artillery type round spooked wheels similar to those on American style 'Case' traction engines. It comes with a four spoked flywheel. Many optional extras are suitable for the this engine.

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D R Mercer Type 2

Available as a kit, Painted kit or ready to run.

The Type two engine is fitted with traditional English style flat spoked wheels similar to those fitted to most full size traction engines you see on a rally field. It comes with a six spoked flywheel, slightly larger than a type one flywheel, a flanged chimney, pressure gauge as standard. Many optional extras are suitable for this engine.

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D.R.Mercer Showmans

Available as a kit, painted kit or ready to run.

The showmans engine is fitted with traditional English style flat spoked wheels similar to those on most full sized traction engines you see on the rally field. This engine is supplied with a solid flywheel, pressure gauge, belly tanks (water tanks), roof canopy, dynamo perch, decorative chimney extensions which lies flat clipped onto the canopy roof & star embossed gear guard as standard . The dynamo and lighting kit are optional extras. Many optional extras are suitable for this engine.


Steam Roller

Temporarily unavailable

The Steam Roller is fitted with traditional English style flat spoked wheels. It comes with a two part front roller with working steering chain and a three holed solid flywheel.
Apologies the roller is currently unavailable but we are working on it and it will hopefully be available again in the near future.

Coming Soon

Optional Extras

Spares & Upgrades

Customise your Mercer engine with a choice of optional extras from small accessories to large engine additions, a number are unique to Minsteam as they are made in house by ourselves.
We can supply all spares for D.R.Mercer engines however big or small, if not listed in this section please email for a price and lead time.

D R Mercer: Products

All engines available in-

Kit Form


Painted Kit

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Ready to Run


At Minsteam we supply collectors & the young at heart with these unique live steam models. We can supply engines as kits, painted kits & ready to run, kits come with easy to follow instructions which include exploded diagrams & instruction for use. Ready to run come fully painted, built & with instructions for use. We are more than happy to help and advise you along the way. Please contact us with any questions.
We are happy to send overseas, This cannot currently be done through our online shop, please email & we will be more than happy to advice on orders & shipping costs etc...

D R Mercer: Process

Old Glory Magazine review

D R Mercer: Gallery
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