7 1/4" Gauge Battery Locomotive


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SPECIFICATION

Dimensions

  • Wheel size 127mm (cut from 5" dia blank) EN8 steel
  • 1" diameter axles
  • Length 2100 mm (7 feet)
  • Width 600 mm (24")
  • Minimum radius - 15 feet (4.5m)

Optional Extras

  • Quick release battery connectors
  • Diesel engine sound unit
  • Speedo
  • Second set of batteries + associated wiring
  • Parking brake
  • Sprung buffers
  • Driver doll  in cab
Technical
  • 8 x 150w motors
  • Direct drive - instant power and braking
  • 24v iDrive digital controller - 120 amp continuous rating
  • Progressive regenerative braking
  • Brass drivers controls
  • Top speed 11-12mph
  • Body 1.2mm steel cab
  • Rear body 18mm birch plywood
  • Commercial bearings
  • Direct drive from axle hung motors
  • Vacuum pump and control for braking
  • 2 x 85amp hour batteries
  • Hi Lo horn
  • Induction ammeter - power drawn + shows regenerative braking
Loosely based on the Romney Hythe and Dymchurch Railway's "Captain Howey" locomotive, the first 7 1/4" gauge locomotive was built in our workshop as part of a working party for the Chingford Model Engineering Club.  The club kindly allowed the locomotive to visit other railways and even the London and Harrogate Model Engineering Shows in 2012.
Not only does the loco perform on its duties at Chingford it has been tested heavily including a train at the East Herts Railway with 5 fully loaded coaches, which included a 1 in 40 climb.

The direct drive means virtually no slack in the drive system so the response between acceleration and braking is nearly instantaneous. The twinning of motors on axles means reduced tooth loading of the gears. The iDrive digital controller offers 24 v pulse width  modulation with a continuous rating of 120amps - a proper commercial controller which is one of the most robust on the market.

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