1.2.0

Expands the map to the Charleston tri-county area and rebuilds special demand.

Coverage

The playable area goes from 3,663 km² to 12,392 km² — -80.68, 32.47 → -79.43, 33.43, 117 × 106 km. The old boundary cut off both Berkeley and Dorchester at the county line, leaving Moncks Corner and St. George — the two county seats — outside the map entirely.

The new box was derived rather than eyeballed: it contains all 27 incorporated places in Charleston, Berkeley and Dorchester counties, 99.3% of tri-county LODES activity by block group, and every barrier-island resort, while trimming the empty Cape Romain marsh and the deepest Francis Marion forest. That keeps it to 3.4× the old area rather than the 4.5× a strict county rectangle would have cost.

Demand

Base demand is regenerated from LODES 2023 via slurry's US Demand Generator — an expanded bbox needs this, or the new territory has no demand at all.

Special demand went from 20 points to 255, applied through depot's add_points, which also emits the .railyard_map/special_demand_*.json schema that 1.0.0 and 1.1.0 both shipped without. Until now the game had no type information for any of these points.

• Schools — 215 points, entirely new. Real per-school enrollment from the NCES Common Core of Data and Private School Universe Survey, public and private, with staff at teacher FTE × 1.9. Summerville High, for instance, now carries 3,308 students and 308 staff. The map previously modelled no school trips whatsoever.
• Airport tourism. AIR_CHS had 6,900 jobs and zero residents, so the map had departing passengers and no arriving ones. It now splits evenly between the two, giving Charleston the inbound visitor flow a tourist city should have.
• Resorts. Kiawah, Wild Dunes, Folly Beach, Seabrook and Edisto, weighted heavily residential — a guest in a beach rental travels out for the day.
• Hospitals, ports, retail, heritage. Eight hospitals sized on OSM bed counts, five port terminals including cruise arrivals at Union Pier, the three malls, the aquarium, City Market, both forts, Patriots Point and the International African American Museum.
• Reclassification. PSWBSF's custom JBCS/JBCN/NWS/NPTU/NPTC/CGC codes now map onto depot's military type, and the generic ENT points are typed as shopping centres, museums, heritage sites and an aquarium.

Sizing follows one rule, documented in build/special/pois.py: a point carries only the trips LODES never sees. Airports carry passengers, not airport workers. Hospitals carry patients, not nurses. merge_within folds the site's existing LODES block point in so its staff aren't counted twice. Schools are the deliberate exception, carrying students and staff without a merge.

Demand totals 561,462 travellers across 2,303 points and 60,290 pops, up from 323,867 across 1,113 points. Commutes and driving paths recomputed through OSRM; median commute is 25.2 km / 27.2 min, up from 21.1 km as the outer county towns come into range.

Map

All layers rebuilt for the new extent from current OSM and Overture data, with GEBCO 2026 bathymetry. CHS.pmtiles is 66 MB, CHS_foundations.pmtiles 20 MB.

Map by PSWBSF. Demand from slurry's US Demand Generator. Schools from NCES. Map data © OpenStreetMap contributors, Overture Maps Foundation, and GEBCO.