Since the train wheels from Big Ben Bricks have become a standard for Lego train model makers could you please consider adding them to Mecabricks? Ben even has LDraw Files available and would surely allow to have them added here 😃 I know you want to avoid parts that are not available from Lego but those wheels are used pretty often.

I'd love to see BBB wheels! 😃

The wheels could be put into either a special category in Vehicles - Trains or Other Compatible Elements.