When isolating a locomotive for fuel conservation and the temperature is 40 degrees or above, what should be done?

When isolating a locomotive for fuel conservation at temperatures of 40 degrees or above, it is essential to isolate the locomotive without draining it. This method allows the locomotive to conserve fuel while maintaining the necessary systems in a ready state for immediate service if required. Keeping the locomotive operational is typically not advisable under these conditions because it would waste fuel unnecessarily. Shutting down or draining the locomotive could lead to complications when restarting or could cause issues with the systems that may need to be preserved for operational readiness. Therefore, isolating but not draining ensures effective fuel conservation while still enabling quick reactivation if needed.