Even in the era of JNR, competition with limited expresses on the regular railway lines operated in parallel with Shinkansen lines existed, but the situation was considered not 'constituting a competitive situation' because both lines were operated by the same company.
国鉄時代から、新幹線に並行する在来線特急との競合はあったが、同一事業者なので一般的には「競合」とはみなされていなかった。