Toy Train BRIO / IKEA compatible

I've build a toy train (BRIO / IKEA compatible) that I've made for my son. This is the older model with 2 types of screws - the newer ones are far better designed and use only 1 type of screws for everything.   You will need 10 screws to put everything together:8x ISO 14585 2.9mm x 13mm2x ISO 14585 2.9mm x 19mm   You can add magnets on each side of the tank car by using 2x ISO 14585 2.9mm x 13mm screws a plastic washer and small neodymium ring magnets diameter 10mm outer / 4mm inner with height of 5mm.