Stackable Train Trays for Ticket to Ride

I made this a Christmas gift for my mom since we play Ticket to Ride all the time at her house. I wanted to make some trays to hold all the little train pieces because it takes a while to count all 45 of them all out, and its easy for them to get disorganized and or lost during a game. I found some Train Trays on Thingiverse (https://www.thingiverse.com/thing:213031) and some other variations, but when I printed it, I realized they would not fit into the box for the game. So I took the stl file into TinkerCad, and re-engineered the trays so that the trains fit onto 3 stackable trays (15 train pieces on each tray) that will also fit in the game box with space left over to hold the regular sized cards from the 1910 expansion.

I modified the trays so that they are friction fit - but due to manufacturing differences in the game pieces themselves, some get stuck on the tray while others are very loose.