How to measure rail-to-earth resistance and rail-to-earth potentials

[tatigo]

Dear forum members,

Would you give please a practical tips how to measure and what measurement equipment to use (with some examples if possible) to measure the rail-to-earth (tunnel) resistance and rail-to-earth (tunnel) potentials?
The measurements needed to be done in the tunnel (cast iron tubes) and above ground also (soil and ballast under the tracks) ?
This is a DC traction metro

Thank you so much.

 

[DPG]

Dear forum members,

Would you give please a practical tips how to measure and what measurement equipment to use (with some examples if possible) to measure the rail-to-earth (tunnel) resistance and rail-to-earth (tunnel) potentials?
The measurements needed to be done in the tunnel (cast iron tubes) and above ground also (soil and ballast under the tracks) ?
This is a DC traction metro

Thank you so much.

Welcome to the forum!

To be honest I think this is a subject for proper training and procedures rather than asking on a forum.

Is this something you need to do as part of your job on the railway?