Kato 20-871 N Scale Unitrack Double Track Variation Set 12 ET48 Parts it connects with snap-together UniJoiners

it connects with snap-together UniJoiners — no nails

UniJoiners snap the bridge to adjoining Unitrack — no nails

Cup joint - 6x19x21mm

and 170mm width

Kato 20-871 N Scale Unitrack Double Track Variation Set 12 ET48 Parts it connects with snap-together UniJoinersKato 20871 Unitrack Double Track Variation Set 12 N Scale Description: The Kato UNITRACK Master (M) and Variation (V) sets are the ultimate expansion track sets, perfect for beginners who are looking to get started in the hobby, while also providing complex structures for those seeking to create more complex and advanced layouts! Starting with the base Master Set, you can expand to create any layout you desire by adding as many Variation sets or