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This model provides 12 wheels for the various items of Lartigue monorail rolling stock available in 00 Scale. The wheels need slight drilling out and are designed to work with 9.2mm length 1mm diameter axles (such as from a large paperclip) slotted into place beneath each coach/truck/engine. These can equally be used as small pulley wheels in other projects.
The video below of the N version explains how to assemble the wheels/track.