Track Extension Pack 4 - 4 X C8205 Straights. Extending your Scalextric track layout has never been easier. The four Scalextric Track Extension Packs are totally flexible in their design. ANY of these packs can be added to ANY Scalextric circuit. Each pack can be incorporated into any Scalextric circuit, from simple ovals and figure-of-eight tracks to the largest layouts. All Track Extension Packs are fully compatible with standard AND Digital layouts.