… Railway or tramway track construction material of iron or steel, the following : rails, check-rails and rack rails, … rods and other crossing pieces, sleepers (cross-ties), fish-plates, chairs, chair wedges, sole plates (base plates), …
Explanatory notes
… 73.02 ‑ Railway or tramway track construction material of iron or steel, the following : rails, … the spaces between these rods are designed to engage the teeth of the cogged wheel beneath the locomotive. A second … creep occurs. These bear against the sleeper or sole plate tending to prevent such longitudinal movement. The heading …