18OE — Rulebook Coverage

Verify M28 London / AA82 Constantinople / I20 Dublin / O28 Le Havre / X33 Marseille are in `yellow:` section in map.rb (edges added in 18oe_testing; section move not yet confirmed)

N31 Lille second token slot for White Cliffs Ferry — pre-printed Lille tile needs a secondary station slot; confirm against physical map

OE9–OE11 — green double-town path edge orientations needed

OE20–OE22 — brown double-town path edge orientations needed

OE19 — tile type unknown; must be identified and defined

Verify standard tile quantities against physical tile manifest

Audit OE-specific tile upgrade paths against physical manifest

Ferry distance numbers — per-zone crossing distances needed for cross-water cost calculations (§8d); sea zone borders themselves are complete

**Ferry sea hexes** — partial work exists; still needed: N29/G22/N25/I22/I24/AE12/AF13/AB21/AB23/AB25

Ferry route engine override — `game.rb` override to whitelist exits toward blue hexes that carry a matching pre-printed path

**Lille↔London ferry** — tiles connect correctly; all other ferry routes blocked pending L2 engine override

**Port sea stubs** `[BETA]` — blue tiles at port entry points use `junction;path=a:X,b:_0,terminal:1` as connectors between land port paths and sea ferry routes; model: land port → stub → sea ferry hexes → stub → land port; implement per port once ferry routing engine override is in place; public vs private port access distinction applies here (see §8d)

**G30 inland port** `[BETA]` — G30 currently has `junction;path=a:4,b:_0` (missing `terminal:1`); inland ports differ from coastal port stubs in routing rules — define and document the distinction before implementing; add `terminal:1` as part of this work

All-pass price reduction — if all players consecutively pass before opening packet is sold, privates pay dividends then all items on topmost row reduce by £5; repeats; items reaching £0 must all be taken by next player

First-OR green tile exception (§11.1.9) — Phase 2 only, first OR after float: if RR cannot connect home token to any town/city via land or ferry without a sea crossing, it may lay one non-city green tile at cost of all remaining tile points; requires ≥1 tile point; cannot be exploited deliberately

Local train town counting: towns beyond city limit fill to train level; express trains skip towns

Combined train runs: Level ≤4 trains combine (sum); Level 5+, 4D, 5D cannot combine

Cross-water costs: Ferry = +£5 track / +£20 token × distance; Sea = +£10 track / +£40 token × zones

Ferry mechanics: distance counts against city limit; public ferry usable by any RR; enemy tokens block

Port authority markers: each reduces sea zone count + ferry distance by 2; 16 total (8 North Sea, 8 Med)

Port authority purchase — majors only, one per major; £125 paid during OR at any point before Buy Trains step; North Sea covers light-blue zones, Mediterranean covers sea-green zones; also reduces cross-water track and token costs

Port authority transfer — major may buy a PA marker from another major during its Transfer Tokens OR step; price exactly £125 to selling major's treasury

Port types: public (any RR) vs private (owning RR only)

Offshore port mechanics: train connects regardless of intervening hexes

Channel passages at Copenhagen and Constantinople

Detect valid OE route: Constantinople (AA82) + one of Paris/London/Berlin/Madrid/Sankt-Peterburg + land track

First-time bonus: £30 (Ph2–4), £60 (Ph5–6), £100 (Ph7–8); OE marker placed on major

+3 RIGHT on first OE run (also §6b)

Train combining: Level ≤4 combine; combined level = sum; city limit = combined level

Subsequent OE runs: no bonus, no extra stock movement

Mandatory OE: if OE route is best possible, president must run it

OE blocked for nationals

D-train bonus does NOT apply to OE first-time bonus

Pullman asset type — does not count against train limit; max 1 per non-national company

Revenue bonus: +£10 × assigned train level, once per OR

Purchase from Minor M: £150 + £15 royalty; J-minor discount on price only

Purchase from Open Market: £150, no royalty; available Phase 4+

Purchase from another RR: negotiated price

Minor M free Pullman: if Minor M not closed at Phase 4 start, places free Pullman

Discard order: rusted trains first; Pullman voluntarily returnable to Open Market

Company with zero trains but holds Pullman: retain until next train acquired

Train type lock for inter-company purchases — minors may only sell to minors, regionals to regionals, majors to majors (§11.3)

Forced purchase — president covers shortfall; else national conversion (majors) or insolvency (minors/regionals)

First-round insolvency: president cash → treasury; company receives reserved 2+2; presidential cert → Open Market; president paid face value

Investigate `Engine::Step::Exchange` in OR step list — minor exchange abilities fire in SR only; confirm Exchange never triggers during OR and remove if vestigial

Major purchases one abandoned minor from Open Market for £60 (to bank); minor's charter + assets added as if merged but no share of major stock issued to former owner

Remove `Engine::Step::Bankrupt` from OR step list — base bankruptcy fires game-end immediately; 18OE force-buy should route to national conversion (BUG-019); replace with a custom no-op or override

Voluntary regional removal — player may remove one unfloated regional during Regional/Minor Phase; max 6 total

Reserved secondary shares — during Initial SR only, each player may designate one regional's secondary (25%) share as reserved; no other player may purchase it until the second SR; cancelled if regional expands to major before its first OR

Trade with another player — during own SR turn, controlling player may offer personal share trade to any other player; recipient not obligated to accept

+3 RIGHT — on the first Orient Express run, share price moves 3 steps right (depends on §8e)

Forming a national (trigger): phase 4/6/8 purchase → `trigger_nationals_formation!` → ordered queue

Forming a national (steps): `Step::ConvertToNational` — cash→bank, treasury certs→OM, tokens removed, national placed, trains inherited

Abandoning a minor (§9.5): triggered by national formation or consolidation failure — `abandon_minor!`: charter→Open Market; trains→Open Market; tokens removed; cash→bank; track rights chit stays

D minor token and L minor marker stay with their charters on abandonment

M minor Pullman stays with charter on abandonment

`national_revenue`: linked/unlinked split, best-first, D-train double, flat-rate fill; `[:payout]` only

Inherent Pullman: `+£10 × highest non-rusted train level`

No tokens / no terrain costs — `return 0 if entity.type == :national` in `upgrade_cost` (BUG-011); skip token step already done

Train limit discard via `depot.reclaim_train`

Merged minors abandoned at national formation (depends on `@minor_track_rights`)

Track rights / OE markers / private markers removed at formation

Exchange owned rusted train for higher-level unclaimed rusted train

Flip owned rusted train from express to local side

Upgrade rusted → non-rusted by purchasing from same-owner major

Conditional merger: major/national may offer; if no offer, company is abandoned

During major's OR Transfer Tokens step: controlling player transfers one token between two majors

Cost: token value (paying major) + token value (receiving major, same zone) + transfer fee (Normal £20 / Grand £40 / Metropolis £60)

Selling a token: returns to charter at highest-cost open position

**7.1** Ability transfer — minor merges into regional/major; ability inherited; nationals cannot inherit

**7.2** Minor A (Silver Banner) — bank pays major current share price at moment of merger

No-stock connection check: merge only if unlimited-city train can reach minor's token to major's network

Player choice on token conflict and train decline

Cross-player personal cash side payment UI

Solicit-offers rule for unmergeable minors

Cannot pass in Consolidation Phase if owns unfloated minors/regionals not yet merged

Consolidation Round forced mergers (§10.6) — hook into `Step::Consolidate`

Second final OR: each company pays same revenue as first final OR; no track/token/train actions (BUG-026)

**7.13** Minor M (CIWL) — holds 10 Pullman cars (see §11.6.2)

**7.9** Minor H (Great Western Steamship) — reduces sea zones by 1 (Ph1–6) or 2 (Ph7–8)

**D (Green Junction)** — sea/ferry variant: unreachable-city placement step where target city is accessible only via sea or ferry

**8.2** Barclay, Bevan, Barclay & Tritton — owner selects one of three abilities at time of use

**8.8** Swift Metropolitan Line — from Phase 4, one controlled RR may keep one 2+2 outside train limit

Setup: randomise and place patronage tiles on map cities at game start (3 pink, 3 yellow, 3 white, 8 green drawn per group, rest discarded)

Payout: when a RR first lays a track tile in a patronage hex during Lay Track step, bank pays one-time bonus equal to tile amount for the highest track color available in current Train Phase; patronage tile removed

Float edge case: minor that places its home token on a patronage hex fulfils it immediately and receives the lowest payout shown on the tile

Smoke spec — `Engine::Game::G18OE.new(%w[A B C D])` does not raise

Basic game flow (auction → regional/minor → major phase)

Train phase transitions (rusting, limits)

Stock market movement (right/left/up/down, edge cases)

Minor ability transfer

Pullman car revenue

National revenue calculation

Orient Express bonus (first run, subsequent runs)