1822MX

1. Heir to the 1822 engine, not directly to 1830
1822MX (Simon Cutforth / Bob Lecuyer / Mexico evolution, 2020) builds on the same engine as 1822: everything is bought at auction (privates, 2-share minors, and major concessions); there's no free company founding like in 1830. See the 1822 explanation for the full list of base differences this system has from 1830.

2. A national company with no president: the NdeM
The big novelty unique to 1822MX: the NdeM (National Railways of Mexico) never has a single director. Every player who owns at least one share takes turns, in player order, performing its track-building action each operating round. In 1830, every public company always has a single president who decides alone.

3. Builder cubes as an alternative to laying tiles
Instead of laying a full tile, a company can leave a "builder cube" on a hex to pre-pay its terrain cost (river, hill, mountain), then lay the tile later at no extra cost. This planning tool doesn't exist in 1830.

4. Interest-bearing loans if a company can't afford a train
In 1830, if a company can't afford a mandatory train, the president puts in money from their own pocket. In 1822MX, in that same situation, the player can take a loan from the bank that accrues 50% interest each stock round if unpaid — a personal-debt mechanic that doesn't exist in 1830.

5. Smaller scale and shorter games than full 1822
1822MX deliberately reduces the number of major companies (7) compared to the original 1822, keeping varied terrain (mountains, rivers) but making it playable faster, helped by builder cubes so players don't get stuck on terrain costs.

6. Mexico City: a megacity with its own rules
Mexico City occupies a double hex with its own upgrade cycle, where every upgrade costs a flat $20 (no cube discounts) and the surrounding hexes are reserved for companies with a concession or director over that area. No city in 1830 gets this kind of special treatment.

7. Selling the director's certificate costs twice as much in share price
If the director sells shares, the company's price drops two spaces; if any other shareholder sells, it only drops one space, regardless of how many shares are sold. In 1830, the price movement on a sale doesn't depend on who sells, only on how many shares go to the pool.

8. Final NdeM privatization by auction
When the first 7/E train is bought, the game pauses: the NdeM runs one last time, then its shares are cashed out. Players holding "Exchange" tokens bid against each other for the NdeM's station tokens. This choreographed final wind-down has no equivalent in 1830.

9. Concessions pay a fixed dividend while unconverted
A major's concession (before it becomes a director's certificate) pays its owner a fixed $10 dividend every operating round, and is lost with no compensation if not converted before phase 5. 1830 has no equivalent intermediate "concession without a company" state.

10. Incremental capitalization until phase 6, full afterward
A company that floats before phase 6 gets capitalized gradually as its shares sell; from phase 6 on it receives all its capital at once (ten times its starting price) and the rest of its shares go straight to the pool. In 1830 capitalization always works the same way, regardless of when a company floats.

1822MX — Schematic summary (vs 1830)

SETTING

• 1822-system engine: everything bought at auction (privates, minors, concessions)
• 7 major companies, smaller scale than full 1822

NdeM (NATIONAL RAILROAD)

• No director: every shareholder participates in turn order
• Final privatization by auction when the first 7/E train is bought

CONSTRUCTION AND FINANCES

• Builder cubes: pre-pay terrain costs
• 50%-interest loans if a train must be paid and there's no treasury
• Mexico City: megacity with flat $20 upgrades

STOCK MARKET

• Selling the director's certificate drops the price twice as much as a normal sale
• Concessions: fixed $10 dividend; lost with no compensation at phase 5
• Incremental capitalization before phase 6, full (10x) capitalization from phase 6 on