Woodland (1935), US patentee (1936), Wallis (1942). All independently replaced the center rail with a slot. The slot mechanism was "ready" in the solution space once small electric motors and toy train rails coexisted — it was waiting for multiple actors to notice it simultaneously. This is the signature of technological readiness: when substrate is available and problem is well-defined, convergence is not surprising. It is expected. The toy form required one additional insight that took until 1957 to appear commercially: that miniature car RACING (not just car running) was a desire worth building a consumer product around.

$500M/yr across 3,000 venues = ~$167K average annual revenue per venue. Slot car tracks had: high fixed costs (real estate, electricity, staff, car fleet, track maintenance) + thin margin revenue (children paying $2/hr) + novelty-sensitive demand (once you've raced, the novelty diminishes). When novelty decays, revenue falls but fixed cost is immovable. The commercial collapse was not product failure — the Aurora Thunderjet-500 in 1969 was as good as in 1965. It was business model failure. The European club model accidentally solved this by replacing novelty-dependent footfall with commitment-based membership. The model, not the product, determines survival.

Analog: circuit-switched — each car has a dedicated lane, dedicated power circuit, dedicated controller. No signal interference because circuits are physically separate. Digital: packet-switched — each car carries an address chip; the shared power rail carries all coded signals simultaneously; each car responds only to its own address. Lane changing is a consequence of the addressing layer, not an independent feature — once each car has identity on the shared medium, routing each car differently becomes possible. This is TCP/IP applied at 12.6V / 600A. The engineers who built DCC for model trains in the 1990s, and the slot car manufacturers who adapted it in 2004, were implementing the packet-switching insight that ARPANET demonstrated in 1969.

Japan's desire for children's competitive vehicle racing was blocked by PTA/school prohibition. The desire did not disappear — it was rerouted through the constraint and emerged as a different, better artifact. The social constraint forced: (1) home-safety (no external venue needed), (2) accessibility (AA batteries vs. track current; no commercial track required), (3) narrative embeddability (autonomous car = character in a story; throttle-controlled car cannot be a narrative protagonist). The forced detour through constraint produced a product that was MORE successful in its domain than the original would have been. Strong constraints on one implementation path often reveal superior implementations that the unconstrained path would never find.

USRA founded 1968. US commercial era dead by 1969. The community needed class-based rules in 1965 when professionals were driving out casual racers — governance arrived 3 years too late to save 95% of commercial venues. Governance requires stable participation to form. Stable participation is a precondition, not an output, of governance. The catch-22: you need the community to build the structure that would have saved the community. Japan's exception: Tamiya Japan Cup (1988, while boom was ongoing) succeeded because the manufacturer was also the governor — Tamiya built governance into the product as a feature, not as a community self-organization effort. Single-actor governance (manufacturer, regulator, funder) is structurally faster than collective governance (community forming from shared interest). The tradeoff: single-actor governance serves the actor's interests first.

Scalextric (1957–2026) sold to Purbeck Capital Partners in 2026. Two possible classifications: (A) Contraction Signal — PE acquires declining niche hobby for asset extraction. Hornby Hobbies held it for 58 years without successful repositioning; new owners may strip and close. (B) Repositioning Signal — PE identifies the nostalgia + analog play revival market (retro gaming, analog toy resurgence, adult hobby expansion post-pandemic) and intends restructuring for it. Evidence for (B): community growth reports 2023–2025; multiple slot car revival coverage pieces in mainstream media. Evidence for (A): if the revival opportunity were clear, Hornby Hobbies had 5+ years to exploit it. This is an unresolved live variable. Classification: PENDING. Watch for: brand contraction vs. product line expansion in 2026–2027 as discriminating signal.