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These components are strong and accurately-etched gearboxes in 0.7mm (0.028") nickel-silver which use ballraces instead of the brass bushes commonly found. They typically include fixings for Canon 1833, Mashima 18xx, 16xx or 14xx motors. More information including Application Notes, Planning Sheets and Instructions are available from the links at the bottom of this page.

Branchlines/Ultrascale Based Gearboxes

These are available in only 13:1 ratio in either motor-mounted ('Power') or non-motor-mounted ('Remote') variants. These were originally developed for diesel locomotive bogies. In either version the gears require a 2mm worm shaft and fit 3/16" diameter axles. The kit includes the fret, gears, bearings and instructions.

Romford Based Gearboxes

Most useful for older or smaller prototypes, these gearboxes are available in 30:1, 40:1 and 54:1 ratios. The fret comes with two motor mounting plates which cover 10mm (Mashima 14xx and 16xx series), 12mm (Mashima 18xx series) and 15mm (Canon 1833) motor fixing screw centres. All gear sets take a 2mm motor shaft and a 3/16" axle. Please order by gear ratio (Rford 30:1, 40:1 or 50:1). The kit includes the fret, gears, bearings and instructions.

Markits Based Gearboxes

These are a variation on the classic Markits ‘7H’ gearboxes, available in 13:1, 20:1, 26:1 and 40:1 ratios. The 40:1 is also available in a 2-stage variant; the 40L. They are each produced with motor fixing screws centres of either 12mm (Mashima 18xx series) or 15mm (Canon 1833). The single-stage gearboxes are additionally available with 10mm motor fixings for Mashima 14xx and 16xx series. Please order by gear ratio and motor/fixing screw centres (Mkits 13:1, 20:1, 26:1, 40:1 / 10mm, 12mm, 15mm). The pack includes the fret, gears, bearings and instructions


These are designed for use with Slater’s 7961 ‘Insulated Square Bearings’ and provide an easy to adjust, insulated, sprung hornblock system which is particularly useful for split axle or ‘American’ pick up approaches. These are a simple assembly in 28thou” (0.7mm) etched brass. To complete you will need a set of springs (such as Slater’s 7164) and the 7961 bearings. Axle cut out required is 7.5mm above axle centre line and 11mm wide.


Good quality steel bearings, as used in the gearboxes.
FR156zz; 3/16"id, 5/16"od, flanged, shielded
MF62zz; 2mm id, 6mm od, flanged, shielded
MF52zz; 2mm id, 5mm od, flanged, shielded.
Other ballraces are available to order, please email us with your requirements, including quantity, and we will be happy to quote .

Constant velocity joints.

A low-cost solution using a ball bearing and a short length of silicone tubing. Fits 2mm shafts: 1 ball bearing, 2cm tube Extra ball bearing Extra cm tubing

6 Hornblocks
Branchlines gears power gearbox. 13:1
£30.00 £30.00
Branchlines gears remote gearbox. 13:1
£36.00 £36.00
Markits gears single stage gearbox. 13:1, 20:1, 26:1 or 40:1 Add ‘-13’ for 13:1, ‘-20’ for 20:1, ‘-26’ for 26:1 or ‘-40’ for 40:1
Markits gears two stage gearbox. 40:1 
Romford gears single stage gearbox. 30:1, 40:1 or 50:1 Add ‘-30’ for 30:1, ‘-40’ for 40:1, or ‘54’ for 54:1
DMU Pack (Includes Canon 1833 motor)
Canon 1833 motor

To obtain a pdf copy of the downloads please click on the links below; the pdf will open in a new window.

Branchlines/Ultrascale-based 13:1 gearboxes
Planning Template for 'Power' and 'Remote' gearboxes Instructions for 'Power' gearboxes Instructions for 'Remote' gearboxes
Markits-based 13:1, 20:1, 26:1, 40:1 gearboxes
Planning template for all Markits-based gearboxes Instructions for Markits single stage gearboxes Instructions for Markits two stage gearboxes
Romford-based 30:1, 40:1 and 54:1 gearboxes
Planning template for all Romford-based gearboxes Instructions for all Romford-based gearboxes
Etched hornguides for use with Slater's 7961 'Insulated Square Bearings'
Instructions for '47961' hornguides