Finally found a Solution How to Retain/Get back ur Lost IMG Trains.Read till the end,I recovered 5 of my IMGs out of 8,USEFUL HACK
➡️ Go to your browser history in which device/Google account u
have created that IMG train.
➡️ Search 'Imaginary' in the search box in the history tool
➡️...
more... Click on the Train u want to retain and as soon as u click on the
desired train the lost train opens up and this train gets
automatically retained/saved in ur IMG List
100% Working,Try It,am sure many of u r finding this problem
Do reply me if it works for urs too