I use your mod. The mod is excellent! And started using "Subsurface - build beneath your base!".
Sub, built an underground railway route. For testing, I launched a single locomotive on this route. It went from the surface to the "metro" to the surface in a circle without problems. But after I launched a train (2 locomotives and 2 cars), then after entering the tunnel, the game was interrupted by error:
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The Cold Chain Logistics mod (0.2.1) has caused an unrecoverable error.
Please report this error to the mod author.

Error while running event Fridge::on_tick (ID 0)
LuaEntity API call when LuaEntity was invalid.
stack traceback:
[C]: in function 'index'
__Fridge/control.lua: 189: in function 'check_wagons'
Fridge/control.lua:243: in function <Fridge/control.lua:230>
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Could you please check the compatibility of these two mods?

Thank you for reporting this issue. The error you posted can no longer occur on the current version of the mod; the remaining problem was that a preservation wagon carried through a Subsurface subway quietly stopped preserving its cargo after its first tunnel transit. This has been corrected: wagons taken through a subway will now keep preserving their contents normally, no matter how many transits they make. The fix will be included in the next update.

--- Handled by the mod's automated maintenance, reviewed by LightningMaster.