1982 · Hartland Trefoil Ltd.
The 18xx MSK 5 extension kit adds 8 tiles: 2 of #55 (yellow), 2 of #56(yellow), 2 of #69 (1853-style, not 1830 style -yellow), and 2 of #11 (green), with a half-page of rules for their use.
Expands:
* 1829
* 1829 Northern Board