#176 1889 D Train Purchase Rule Not Implemented
1889 has an uncommon 18xx rule when it comes to the purchase of D trains. This rule has not been implemented in v1.x or v2.x of Rails.
Following quote is from the rulebook with bolded section not implemented in Rails system:
11.10.4.1 Bank Trains
The Bank sells new trains, and will sell these trains in order. 2-trains are available for sale first. After all of the 2-trains have been purchased, 3-trains are available. Similarly each new type of train is only available after all of the previous type of train been sold, except that Diesels are available for purchase as soon as the first 6-train has been purchased.
In effect, after the first 6-train is purchased, the next Buy Train action needs to show two Buy from IPO options: the 2nd 6-train and a Diesel.