Flangeless

Immediately outside the rails of 3-ft. gauge, on which the ordinary cars run, are laid smaller rails ⅞ in. lower ; on these run the flangeless wagon wheels, kept in position by the higher rails, which thus act as check rails ; [...].

Ivatt was represented by 4-2-2 No. 262, his first 4-4-0, No. 400, and 2-2-2 No. 92, which had the flangeless driving wheels from Sturrock's famous 4-2-2 No. 215.