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Twin-pack kit 2-528 from the Association for four plank (O3) and five-plank (O5) wagons for ca 1890-1950.

The information from the 2mm Association website suggests using the 2-361 chassis for both O3 and O5. This is correct, but not very helpful. In particular, only about 200 four-plank wagons were built to diagram O5, using the 9 ft DC underframe, whilst over 20,000 were built using the earlier conventional single-sided brake system without a diagram number, of which about 18,000 survived to be updated to double-sided version with the diagram number O21 in 1927-1930 (both of which are represented by underframe 2-330 and 2-335 conversion kit for steel solebars, together with separate axleboxes and springs).

It is fairly trivial to create a three-plank wagon from the four-planks O5, simply by filing off one plank before assembling the body (fortunately there is no diagonal strapping on four-plank and less).
 

Components

Five plank (O5), and Four plank O3

  • 2-361 Etch for 9' wheelbase chassis, DC brakes
  • 2-041 Wheel bearings x4 (packed in 50s)
  • 2-010 Wheels - spoked (x2 axles)
  • Buffers of choice - probably 2-072  x4
  • Couplings of choice

Optionally

  • 2-343 Hybar conversion kit
  • 2-346 Vacuum cylinders (packed in 5s)

Four plank other than O3

  • 2-330 9' wheelbase chassis
  • 2-335 conversion to steel solebars
  • 2-041 Wheel bearings x4 (packed in 50s)
  • 2-010 Wheels - spoked (x2 axles)
  • Axleboxes of choice - probably 2-471 or 2-472 prior to 1910 (grease), 2-473 subsequently (oil)
  • Springs of choice - probably 2-462 (5 leaf) or 2-463 (9 leaf)
  • Buffers of choice - probably 2-072 x4
  • Couplings of choice

Literature

A History of GWR Goods Wagons by Atkins, Beard, Hyde & Touret (David & Charles)