question: What is the solution many lines came up with in order to avoid replacing present rolling stock ?
answer: to be overlaid with multiple electrification standards
turker_answer: In order to avoid replacing present rolling stock , the solution many lines came up with was to be overlaid with multiple electrification standards .
rule-based: The solution many lines is came up with to be overlaid with multiple electrification standards in order to avoid replacing present rolling stock .