Bucharest metro (metrorex) line M2 would be cool i would say. 2 train models operate on this line currently, Bombardier Movia 346 BM2/BM21, and CAF BM3. in the 2000s, these did not operate, instead there were the Astra Iva BM1 models, that could be a separate pack, like the 1938 heritage pack on the bakerloo line. Bombardier Movia 346 BM2 at station PIATA ROMANA