Comment 2 for bug 1662443

If the tender is missing then there will be no coal and fuel to supply the locomotive, so whatever water is in the boiler, and coal in the fire is what the locomotive will run on. This means that both coal and water will be "exhausted" very quickly, and the locomotive will loose power. If the game starts without the tender, then there probably should be no coal or water in the locomotive at all.

Naturally a tank locomotive carries coal and water on the locomotive and doesn't require a separate tender.

OR powers down the locomotive if coal or water are exhausted.

MSTS catered for this with the parameter "IsTenderRequired". I am thinking of implementing this, but I am just trying to think about the impact for any recent OR only locomotives that may not have this parameter present.