Multi-Prize/Train Builder

I was thinking wouldn't it be cool if you could build your train cars on a single page and then just link it to the train?

At a high level it would mean a train needs;

• Name
• Defined period
• Tag to identify it as a train

Then when creating, if you choose the train flag new options would appear.

• New Train (see above options) +
• Existing Train
  • choose from a list of trains (not expired)

Then build your cars by

• adding game
• key
• region
• then add line (repeat above until done)

Date/time would already be defined by the train creator
Click review and all the carts automatically get assigned a car number and pre-formatted forward/back options etc
+Other rules about how to find them/enter as I know most don't want them in the main stream

Anyways, just an idea... I was originally thinking something similar for building game+DLC multi win, but 60ish cars into the community train re-framed it lol