Lighting Brick

What there is most of

• Light Brick 1 x 2 with Single Side Light · White×1
• Light Prism Brick, Train, 1 x 4 Holder · Black×1
• Light Prism, Train, 1 x 4 · Trans-Yellow×1
• Plate 2 x 4 with Electric Contacts · White×1

The twenty most numerous parts, longest bar first. Start a checklist to see all 4 part types and tick them off as you find them.