Clark Railworks unveils Class 21 'Pug' 0-4-0STs for 'OO' & 'O'
The Lancashire & Yorkshire Railway (L&YR) Class 21 ‘Pug’ is to be immortalised for 'OO' and 'O' courtesy of Clark Railworks. Known for their compact design and hardworking spirit, these iconic shunters feature a promising specification packed with exquisite detail and authentic features.
Whether you’re a fan of historic shunting locomotives, a modeller seeking something unique, or simply charmed by these pint-sized powerhouses, these new 'Pugs' promise to delight.
Release & pricing
O gauge: launching summer 2026 – £325 (DCC ready)
OO gauge: launching late-2026 / early-2027 – £150 (DCC ready)
DCC Sound-fitted prices to be confirmed soon.
📦 Pre-orders open now, with no upfront payment required:
👉 Pre-order O gauge models here
👉 Pre-order OO gauge models here
Why choose a 'Pug'?
'Pugs' are perfect for layouts of all sizes. Their compact wheelbase makes them at home in dockside or industrial shunting scenes, while their historical significance makes them a must-have for collectors. With Ellis Clark Trains and Clark Railworks’ commitment to detail and quality, these small locomotives are packed with big features – and plenty of heart.
Don’t miss your chance to own one of the most characterful little locomotives in railway history. Pre-order today to secure your Pug delivery in the guise you really want!
History in brief
The L&YR 'Pugs' were designed in 1891 by Chief Mechanical Engineer John Aspinall to handle the tight curves and cramped conditions of docks and yards across the north of England.
57 locomotives were built between 1891–1910. They became Class 21 in 1920 and later joined the LMS fleet. Many survived well into the 1960s, serving at factories, power stations, and industrial sites across Britain.
Today, two 'Pugs' are preserved: one at the East Lancashire Railway, the other at the Keighley & Worth Valley Railway.
Their nickname, 'Pug', comes from their short wheelbase and side-to-side ‘boxing’ motion – like a pugilist in the ring. Despite their small size, these were fiesty little locomotives!
C1021 Clark Railworks OO gauge L&Y Class 21 Pug LMS Black 1926 (sound-fitted). Pre-order here.
Model variants
Though all 'Pugs' shared the same outline design, there were many subtle differences, including:
- Smoke deflectors for locomotives working into warehouses or under the Liverpool Overhead Railway
- Haystack spark arrestors during WWI at Ormskirk’s munitions works
- Bells fitted for dockside running where engines shared roads with vehicles
- Buffer types changed over time, from circular sprung buffers to wood-and-rubber dumb buffers
Such details make 'Pugs' fascinating for model collectors, offering variety and customisation
📦 Pre-orders open now, with no upfront payment required:
👉 Pre-order O gauge models here
👉 Pre-order OO gauge models here
Technical specifications
"We’ve poured passion into recreating these characterful little locomotives, ensuring accuracy, quality, and playability." said Ellis Clark of Clark Railworks. "Both O gauge and OO gauge 'Pugs' come with high-quality die-cast construction for weight and realism, smooth-running coreless motors, and superb cab/backhead detail."
🔧 O Gauge specification
Opening smokebox door with full interior detail
Full inside working motion
Intricately detailed cab & backhead
Die-cast construction with sprung buffers
Firebox & ashpan glow (DCC versions)
Plux22 socket (DCC ready)
DCC sound options with stay-alive and twin speakers
🔧 OO Gauge Specification
Die-cast construction with sprung buffers
Semi-open chassis with space for EM/P4 conversion
Detailed cab & backhead
Firebox glow (DCC versions)
Plux12 socket (DCC ready)
DCC sound with stay-alive and bespoke recordings
Lineup and liveries
The range is being launched with 11 versions in each scale, spanning L&Y, LMS, BR, industrial and preservation eras. Highlights include:
L&Y No. 155 in lined black
LMS No. 11247
BR Nos. 51218, 51229, 51234, 51241
Industrial liveries including Bassett, Prince, and Weston in their unique colours
Preserved examples including No. 19 and No. 68
(Full SKU lists are available on our websites.)
Release & pricing
O gauge: launching summer 2026 – £325 (DCC ready)
OO gauge: launching late-2026 / early-2027 – £150 (DCC ready)
DCC Sound-fitted prices to be confirmed soon.
📦 Pre-orders open now, with no upfront payment required:
