Need used rails, 50,000 mt monthly to UK

I would like to buy used rails.
Looking for a supplier who can meet the following requirements.
First trial order (in the first month shipment): 25,000 MT.
Every other month:50,000 MT.
No upfront payment. We want to open a letter of credit instrument all the way (100%).
A live video presentation of your used rails would be essential to determine the seller can be trusted.
A copy of one sales track record to show capability would be essential to us.
Looking forward to your offers.