F.ttp_begin({
 stn = "Spawn Main", -- station name
 tt = "S12_N", -- timetable ID
 depint = "02;30", --departure slot interval
 depoff = "00;45", --departure slot offset
 doorside = "R",
 reverse = true,
 only_lines = { S12 = true },
 force_tt_reset =false,
})