[MTR4] Bombardier Movia BM21

This resource pack adds the Bombardier Movia 346 train (known as BM21) from the Bucharest Metro, Romania to Minecraft Transit Railway. The package includes both end and middle carriages of this train set.

Future updates will expand content related to Bucharest's metro system. Currently, there are some issues with gaps in the gangway connections between carriages, but these will be resolved soon. Bogie models and destination board systems are also under development.