Here is what it said (not all of it i have a screenshot if you want):
Error while running event RenaiTransportation;;on_nth_tick(1)
LuaInventory doesn't contain key count.
stack traceback:
[C]: in function 'index'
__RenaiTransportation/script/trains/on_tick.lua:570: in function 'handle_trains'
RenaiTransportation/script/event/on_tick.lua:11: in function
<RenaiTransportation/script/event/on_tick.lua:9>

thats all other than it telling me to report this to the mod author this happened when i was in creative and put 1 stack of atomic bombs 1 stack of explosives and 1 stack of cluster grenades in a payload wagon and launched the train right when it hit i got the error.

Here is what it said (not all of it i have a screenshot if you want):
Error while running event RenaiTransportation;;on_nth_tick(1)
LuaInventory doesn't contain key count.
stack traceback:
[C]: in function 'index'
__RenaiTransportation/script/trains/on_tick.lua:570: in function 'handle_trains'
RenaiTransportation/script/event/on_tick.lua:11: in function
<RenaiTransportation/script/event/on_tick.lua:9>

thats all other than it telling me to report this to the mod author this happened when i was in creative and put 1 stack of atomic bombs 1 stack of explosives and 1 stack of cluster grenades in a payload wagon and launched the train right when it hit i got the error.
note: some of the _ were gone beacuse it just made it made it bolded, heres the screenshot: https://cdn.discordapp.com/attachments/1340075131992805408/1398587835782795264/image.png?ex=6885e7ec&is=6884966c&hm=c1e4845e946d3a91e21c819ec901df19c9c6a5f89aa6446ec84b23e7b401ff88&

Interesting, they must have change atomic bombs since I last tested with them. I store items differently based on how they are coded and apparently I never updated the payload wagon explosion to take those into account. Should be an easy fix, thanks for the report