18SJ: Railways in the Frozen North

1. Setting and map
1830 covers the northeastern US. 18SJ takes place in the united kingdoms of Sweden and Norway, during the years when the main lines ("stambanor") of the Nordic railway network were built.

2. Curved track "without the doinks" of 1830
18SJ keeps the curved-track style used by 1830, but polished to avoid the small visual or connection mismatches ("doinks") that sometimes show up on the 1830 board when certain tiles are combined.

3. Simple nationalization of public companies
A mechanic that doesn't exist in 1830: 18SJ includes a simple nationalization mechanism for public railway companies, simulating how the state gradually absorbed part of the network. As a result, each game can end with a different number of companies still active.

4. The real goal is personal wealth, not company health
In 1830, looking after your own company's financial health usually goes hand in hand with winning the game. In 18SJ it's explicitly emphasized that companies are just a means: a player can drain a company's treasury for personal gain and leave it practically empty in the hands of an unsuspecting rival. Whoever ends the game with the most personal wealth wins, regardless of how the companies ended up.

5. Tighter starting treasury for companies
In the basic version of 18SJ, companies' starting treasury tends to be more limited than what's usually seen in 1830, forcing tighter management of the early turns.

6. The possibility of "passing on" a drained company
Related to point 4: since value can be extracted from a company without necessarily worrying about its survival, 18SJ allows strategies of "letting go" of an already squeezed company so another player inherits its problems — a social dynamic that 1830 doesn't highlight in the same way.

7. Influence from several 18xx designs, not just 1830
Although built on the 1830 engine, 18SJ incorporates ideas and sensibilities from other titles in the 18xx family, rather than being a simple new setting on top of the original rules.

8. Specific theme: building the Nordic main lines
18SJ specifically simulates the construction of Sweden's "stambanor" (main lines), a very specific historical episode with no thematic equivalent in 1830.

9. Variable number of surviving companies at the end
Because of the progressive nationalization (point 3), the number of active companies at the end of 18SJ isn't fixed the way it tends to be in 1830, where all founded companies usually stay active until the end.

10. Designed for players who already know 1830
18SJ is presented as a thematic and mechanical evolution of 1830 for those who already know its basics and want to explore variants with nationalization and a philosophy more focused on personal wealth than on company survival.

18SJ Railways in the Frozen North — Schematic summary (vs 1830)

SETTING

• United kingdoms of Sweden and Norway — building the Nordic main lines

NATIONALIZATION AND PHILOSOPHY

• Simple nationalization mechanism for public companies → variable number of surviving companies
• The goal is personal wealth: you can drain a company and "pass it on" to a rival

MECHANICAL DETAILS

• Curved track in the 1830 style, but without the typical "doinks"
• Tighter starting treasury for companies than in 1830