Highley retains its original 14 lever McKenzie and Holland 1873 patent lever frame, with 11 working levers, 3 spare, and no spaces. The interlocking was replaced in 1903 with more standard tappet interlocking by the GWR.
<gallery>
File:Highley box interior 2.jpg | Interlocking mechanism
File:Highley box interior 1.jpg | Point rodding and bell cranks
</gallery>
=== Block Sections ===