I would think that any important track, that saw many, many trains daily, and especially saw several trains at night, these major turnouts would have kerosene lanterns ... and any track that was very seldomly used, had metal flag turnouts, like unimportant yard tracks, and branchline yards, that only saw possibly one train daily, or maybe only several trains per week. Keeping each and every turnout lit up, with kerosene lanterns would have cost a huge fortune in lamp oil, wicks, and switch maintainers time ... costing millions of dollars ... just like each and every yard track being lit up with signals ... it just wasn't done ... and allot of unimportant tracks were dark, with no signals, or switch lanterns.