PCB sleepers and turnout timbers have been added. I placed small offcuts of PCB sheet where the track will cross the baseboard edges. PCB components were used because I am modelling typical early 20th Century light railway track with flat-bottomed rails.
Incidentally, the turnout timbers are labelled as 'turnout sleepering' on the S1-025 packet. Turnouts have timbers; only plain track has sleepers, I thought?