7 1/4" Gauge Battery Locomotive

Tram Engine


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SPECIFICATION

Dimensions

  • Wheel size 127mm (cut from 5" dia blank) EN8 steel
  • 1" diameter axles
  • Length 1140 mm (29")
  • Width 500 mm (19.5")
  • Minimum radius - 15 feet (4.5m)

Optional Extras

  • Door entry to allow easy access
  • Quick release battery connectors
  • Chuffer sound unit
  • Steam whistle sound unit
  • Sprung buffers
  • Gong
  • Vacuum pump and control for  train braking
  • Induction ammeter - power drawn + shows regenerative braking
  • Battery charger
Technical
  • 8 x 150w motors
  • Direct drive - instant power and braking
  • 24v iDrive digital controller - 120 amp continuous rating
  • Progressive regenerative braking
  • Top speed 11-12mph
  • Commercial bearings
  • Direct drive from axle hung motors
  • 2 x 85amp hour batteries (not included)
  • 6mm and 3mm steel chassis
  • 24mm birch plywood body + 3mm overlay frame
The tram engine was built on the same steel chassis used for the saddle tank. There is enough room for one person to sit comfortably although I have often had to squash in my kids.

The body is constructed from a 25mm birch plywood frame with 3mm frame overlays.
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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