Letter Scrap 5: Map
Head into this tunnel
Letter Scrap 5 Location

Location

Cypress Hills: Train Tunnel heading North

Access

Get to the shown access point. Run to the North through the tunnel. Be on guard for an incoming train. If one comes either get onto the opposite track or duck into one of the numerous alcoves on the Eastern or Western sides of the tunnel. You will find the letter scrap in the alcove numbered 5748.