...Partially or fully loaded a Train but didn't send it out?
The next time you enter your Train Depot, you'll get your loaded items back!
...Sent a Train out that didn't return in time?
The next time you enter your Train Depot, you'll get your rewards! (but no points for the delivery)
...Sent a Train out that returned in time, but I forgot to collect from during the event?
The next time you enter your Train Depot, you'll get your rewards! (but no points for the delivery)