'bonding plan' or 'track insulation plan' ?

[PJW]

hi signal professional:

Does anyone know what is 'bonding plan' or 'track insulation plan' ?
does anyone have a copy or example of bonding plan or track insulation plan, that i can at least know what it looks like
thanks

Hi

A bonding plan shows a railway as two lines (one for each rail), whereas a signalling plan shows it as one. All electrical connections and insulations in the rails, for track circuit and electric traction purposes are shown. It forms a full spec for track circuit, electric traction return and insulated rail joints.

cheers
Reuben

and here is a slightly different example (the .jpg).
This is actually called an IRJ Plan and was a presentation common on the Western Region; it is effectively a Bonding Plan combined with a Location Area Plan.
This example is actually for alteration work; the new work is shown in Red, the old work to be recovered is in Green and the unaltered in black. However the work being undertaken is very minor- some old locations are being abolished and the track circuits re-engineered, but with the changeover occuring in trackside disconnection boxes- hence "no change" as far as the actual rails and bonding shown on this plan are concerned.

The main reason for adding this plan is that it is an example of 3rd rail dc electrification with a mixture of single rail and double rail track circuits, together with the associated impedance bonds that permit dc traction current to return to the substation bypassing the Insulated Block Joints whilst largely blocking the ac track circuit current.
There would also be an associated "neggy bonding" plan which depicts how various parallel paths available for the traction current to get back to the sub-station; a traction engineer's responsibility rather than signal engineer's but we still need to know about it!

I have also included an extract of a similar plan (.pdf)for non-electrified railway

In contrast, Reuben's example showed overhead 25kV electrification together with stanchion masts and signal structures etc all earth bonded to the traction return rail.