Russian Railroads

Top and bottom rails are separate tracks: you extend each color on its own rail following the range and placement restrictions, and the black track is advanced independently from the colored rails; you can only extend a rail where its action allows (top vs bottom). (Rulebook pp.6–7)

Placing a new locomotive advances existing locomotives to the right, which can cause chain reactions of movement; if a locomotive cannot be placed on the track it is turned into a factory instead. (Rulebook pp.8–9)

Factories are created or replaced by industrialization actions or when locomotives are turned into factories, and their benefits trigger immediately as described on the factory tile; different industrial actions determine which factory options are available. (Rulebook pp.11–12)

Workers placed on the turn-order track remain there until the turn-order is reorganized; you only retrieve (and may reuse) those workers when the reorganization returns them to your supply according to the turn-order rules. (Rulebook p.15)

Engineers provide the in-game benefits shown on their tiles (including left-most and light-side rules) when hired or used, and at game end engineers are scored for majority as part of final scoring with movement and majority rules described in the scoring phase. (Rulebook pp.13–14, 20)

Railroad and industrial scoring follow the scoring-phase procedures (score railroads and industry as described), the Last Round is triggered and handled via the Last Round/replacement action, and final scoring then includes end-bonus cards and engineer majority as detailed. (Rulebook pp.18–20)